The Roman numeral CMXCVII corresponds to the Arabic number 997.
CMXCVII = 997
Symbols are written and read from left to right, from highest to lowest.
If number CMXCVII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 997.
CMXCVI is number 996
CMXCVIII is number 998
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