The Roman numeral MDCXLV corresponds to the Arabic number 1645.
MDCXLV = 1645
Symbols are written and read from left to right, from highest to lowest.
If number MDCXLV is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1645.
MDCXLIV is number 1644
MDCXLVI is number 1646
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