It could be: (M)M which means 1,000*1,000*1,000 = 1,000,000,000
But in all reality the ancient Romans had little need for such huge numbers
Ways to write one billion is: one billion,1 billion,1,000,000,000,you can write it in roman numeral several different ways,with tally marks, etc.
1,000,000,000
One-tenth of a billion is one hundred million, which is 100,000,000 in numerals.
1,400,000,000
The correct term for ten hundred billion is one trillion, which is 1,000,000,000,000 in numbers.
1000000800
1,000,000,000,000,000 (one quadrillion).
1,000,400,000
Expressed in numbers, this is equal to 1,338,000,000.
There are many different ways one might write the numbers '608.' If one desires to write the numbers '608' in Roman numerals, one would write 'DCVIII.'
As a number it is: 180,000,000,000 = 180 billion
1,200,000,000