VIXII is not a correct Roman numeral as it does not conform to the rules associated with them. VI = 6 and XII = 12 so if VIXII existed it could mean 6 less than 12, which is simply 6.

This is not a valid roman numeral!

It is: 5 = V as a Roman numeral

XXL is not a valid roman numeral.

Unfortunately, the roman numeral 'Z' does not exist. ):

The Roman numeral of DXIII is equivalent to 513

You mean Roman Numeral? It is XVI

It is the Roman Numeral for the number 6. It is the Roman Numeral for the number 6.

The Roman numeral CCLXVI represents the number 266

The roman numeral M represents the number 1000.

The Roman numeral CXXXVI represents the number 136

The Roman numeral MCMLXXII represents the number 1972

The Roman numeral MCMXC represents the number 1990

The Roman numeral MMDCXLI represents the number 2641

The roman numeral VII or vii represents the number 7.

That is not a valid Roman Numeral. MMLI would be okay, or MCMI.