CMXC
It could be written as XM, but that is not considered correct today.
The numeral 9999999999 is 9,999,999,999 and is written "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred and ninety-nine."
The number that comes after nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred ninety-nine (999,999,999) is one billion (1,000,000,000). In numeral form, this is represented as 1,000,000,000.
Nine Thousand, Nine Hundred and Ninety Nine = 9,999 = Four digits.
99,999 (Ninety-nine thousand, nine hundred ninety-nine.)
XCIX is the number 99 (ninety-nine).
It is 999,999 (nine hundred ninety-nine thousand, nine hundred ninety-nine).
The numeral 9999999999 is 9,999,999,999 and is written "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred and ninety-nine."
The number that comes after nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred ninety-nine (999,999,999) is one billion (1,000,000,000). In numeral form, this is represented as 1,000,000,000.
Nine Thousand, Nine Hundred and Ninety Nine = 9,999 = Four digits.
The Roman numeral for 99 is XCIX
99,999 (Ninety-nine thousand, nine hundred ninety-nine.)
ninety-nine sexquinquagintillion, nine hundred ninety-nine quinquinquagintillion, nine hundred ninety-nine quattuorquinquagintillion, nine hundred ninety-nine trequinquagintillion, nine hundred ninety-nine duoquinquagintillion, nine hundred ninety-nine unquinquagintillion, nine hundred ninety-nine quinquagintillion, nine hundred ninety-nine novemquadragintillion, nine hundred ninety-nine octoquadragintillion, nine hundred ninety-nine septenquadragintillion, nine hundred ninety-nine sexquadragintillion, nine hundred ninety-nine quinquadragintillion, nine hundred ninety-nine quattuorquadragintillion, nine hundred ninety-nine trequadragintillion, nine hundred ninety-nine duoquadragintillion, nine hundred ninety-nine unquadragintillion, nine hundred ninety-nine quadragintillion, nine hundred ninety-nine novemtrigintillion, nine hundred ninety-nine octotrigintillion, nine hundred ninety-nine septentrigintillion, nine hundred ninety-nine sextrigintillion, nine hundred ninety-nine quintrigintillion, nine hundred ninety-nine quattuortrigintillion, nine hundred ninety-nine tretrigintillion, nine hundred ninety-nine duotrigintillion, nine hundred ninety-nine untrigintillion, nine hundred ninety-nine trigintillion, nine hundred ninety-nine novemvigintillion, nine hundred ninety-nine octovigintillion, nine hundred ninety-nine septenvigintillion, nine hundred ninety-nine sexvigintillion, nine hundred ninety-nine quinvigintillion, nine hundred ninety-nine quattuorvigintillion, nine hundred ninety-nine trevigintillion, nine hundred ninety-nine duovigintillion, nine hundred ninety-nine unvigintillion, nine hundred ninety-nine vigintillion, nine hundred ninety-nine novemdecillion, nine hundred ninety-nine octodecillion, nine hundred ninety-nine septendecillion, nine hundred ninety-nine sexdecillion, nine hundred ninety-nine quindecillion, nine hundred ninety-nine quattuordecillion, nine hundred ninety-nine tredecillion, nine hundred ninety-nine duodecillion, nine hundred ninety-nine undecillion, nine hundred ninety-nine decillion, nine hundred ninety-nine nonillion, nine hundred ninety-nine octillion, nine hundred ninety-nine septillion, nine hundred ninety-nine sextillion, nine hundred ninety-nine quintillion, nine hundred ninety-nine quadrillion, nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine
Nine hundred ninety-nine sexdecillion, nine hundred ninety-nine quindecillion, nine hundred ninety-nine quattuordecillion, nine hundred ninety-nine tredecillion, nine hundred ninety-nine duodecillion, nine hundred ninety-nine undecillion, nine hundred ninety-nine decillion, nine hundred ninety-nine nonillion, nine hundred ninety-nine octillion, nine hundred ninety-nine septillion, nine hundred ninety-nine sextillion, nine hundred ninety-nine quintillion, nine hundred ninety-nine quadrillion, nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine.
Nine hundred ninety-nine novemdecillion, nine hundred ninety-nine octodecillion, nine hundred ninety-nine septendecillion, nine hundred ninety-nine sexdecillion, nine hundred ninety-nine quindecillion, nine hundred ninety-nine quattuordecillion, nine hundred ninety-nine tredecillion, nine hundred ninety-nine duodecillion, nine hundred ninety-nine undecillion, nine hundred ninety-nine decillion, nine hundred ninety-nine nonillion, nine hundred ninety-nine octillion, nine hundred ninety-nine septillion, nine hundred ninety-nine sextillion, nine hundred ninety-nine quintillion, nine hundred ninety-nine quadrillion, nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine and one.
XCIX is the number 99 (ninety-nine).
Oh, what a delightful number! Let's paint a picture with words: that number is nine hundred ninety-nine tredecillion, nine hundred ninety-nine duodecillion, nine hundred ninety-nine undecillion, nine hundred ninety-nine decillion, nine hundred ninety-nine nonillion, nine hundred ninety-nine octillion, nine hundred ninety-nine septillion, nine hundred ninety-nine sextillion, nine hundred ninety-nine quintillion, nine hundred ninety-nine quadrillion, nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine. Isn't that just lovely?
Simple: ninety-nine octovigintillion, nine hundred ninety-nine septenvigintillion, nine hundred ninety-nine sexvigintillion, nine hundred ninety-nine quinvigintillion, nine hundred ninety-nine quattuorvigintillion, nine hundred ninety-nine trevigintillion, nine hundred ninety-nine duovigintillion, nine hundred ninety-nine unvigintillion, nine hundred ninety-nine vigintillion, nine hundred ninety-nine novemdecillion, nine hundred ninety-nine octodecillion, nine hundred ninety-nine septendecillion, nine hundred ninety-nine sexdecillion, nine hundred ninety-nine quindecillion, nine hundred ninety-nine quattuordecillion, nine hundred ninety-nine tredecillion, nine hundred ninety-nine duodecillion, nine hundred ninety-nine undecillion, nine hundred ninety-nine decillion, nine hundred ninety-nine nonillion, nine hundred ninety-nine octillion, nine hundred ninety-nine septillion, nine hundred ninety-nine sextillion, nine hundred ninety-nine quintillion, nine hundred ninety-nine quadrillion, nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine.