Q: What is the sum of all factors of the number 666,661 excluding 666,661?

 A: 2,139

Why is 2,139 the sum of all factors of 666,661, excluding 666,661?

The factors of the number 666,661 are: 1, 379, 1759, 666661.

If you add them up, you will get the total of 666,663. Now subtract 666,661 to get 2,139


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