1656
Improved Answer:-
1666 because MDCLXVI = 1000+500+100+50+10+5+1 = 1666
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MDCLXVI = 1000+500+100+50+10+5+1 = 1666
1666 = mdclxvi
1666 = MDCLXVI
So as to read out the numerals in a logical descending order as for example MDCLXVI = 1666
MDCLXVI (M=1000, DC=600, LX=60, VI=6)