668 = 22 x 167.
668 is the number of integer partitions of 36 into distinct parts.
668 is a number that cannot be written as a sum of three squares.
668 = 36 - 61.
334,668 = 6682 - 3342 = (334 + 668) x 334, where 668 = 2 x 334.
668 is the number of legal pawn moves in chess.
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