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In today's notation 645 = DCXLV in Roman numerals
On an US coin it can mean "cents" or it can be the mint mark of the Charlotte Mint, which existed only from 1838 to 1861.
The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
645 - 577 = 68
25 cents