M = 1000
But under certain additional conditions the numeral M can be modified to represent the number 1*1016 in standard form which is 10 000 000 000 000 000 in numerical value.
Even higher numbers are possible
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The largest number you can write using Roman numerals without an overline at any symbol is 3999 (MMMCMXCIX), and the largest possible number is 3999999 (MMMCMXCIXCMXCIX, with an overline over the first nine letters.
MDC = 1600
The number one is I in roman numerals.
A does not have an equivalent in Roman numerals.
The number 49 in Roman numerals is XLIX and the number 99 in Roman numerals is XCIX