1, 3, 13, 17, 39, 51, 221, 663.
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An infinite amount of things equal 663. A few examples: 663-0, 663*1, 663+0, 663/1
663 = DCLXIII
663 = DCLXIII
The divisors of 66 are 1,2,3,6,11,22,33 and 66.
The divisors of 79 are: 1, 79.