Q: What is the sum of all factors of the number 666,521,210 excluding 666,521,210?

A: 647,603,350

Why is 647,603,350 the sum of all factors of 666,521,210, excluding 666,521,210?

The factors of the number 666,521,210 are: 1, 2, 5, 10, 17, 29, 34, 58, 85, 145, 170, 290, 493, 986, 2465, 4930, 135197, 270394, 675985, 1351970, 2298349, 3920713, 4596698, 7841426, 11491745, 19603565, 22983490, 39207130, 66652121, 133304242, 333260605, 666521210.

If you add them up, you will get the total of 666,521,857. Now subtract 666,521,210 to get 647,603,350