The Roman numeral DCCCLVII corresponds to the Arabic number 857.
DCCCLVII = 857
Symbols are written and read from left to right, from highest to lowest.
If number DCCCLVII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 857.
DCCCLVI is number 856
DCCCLVIII is number 858
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