The Roman numeral DCCCXLV corresponds to the Arabic number 845.
DCCCXLV = 845
Symbols are written and read from left to right, from highest to lowest.
If number DCCCXLV is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 845.
DCCCXLIV is number 844
DCCCXLVI is number 846
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