Q: What is the sum of all factors of the number 666,726,621 excluding 666,726,621?

A: 363,655,587

Why is 363,655,587 the sum of all factors of 666,726,621, excluding 666,726,621?

The factors of the number 666,726,621 are: 1, 3, 11, 17, 33, 51, 187, 313, 561, 939, 3443, 3797, 5321, 10329, 11391, 15963, 41767, 58531, 64549, 125301, 175593, 193647, 710039, 1188461, 2130117, 3565383, 13073071, 20203837, 39219213, 60611511, 222242207, 666726621.

If you add them up, you will get the total of 666,726,984. Now subtract 666,726,621 to get 363,655,587