Q: What is the sum of all factors of the number 1,665 excluding 1,665?

 A: 1,299

Why is 1,299 the sum of all factors of 1,665, excluding 1,665?

The factors of the number 1,665 are: 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1665.

If you add them up, you will get the total of 1,666. Now subtract 1,665 to get 1,299


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