The factors of the number 660,660 are: 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 20, 21, 22, 26, 28, 30, 33, 35, 39, 42, 44, 52, 55, 60, 65, 66, 70, 77, 78, 84, 91, 105, 110, 121, 130, 132, 140, 143, 154, 156, 165, 182, 195, 210, 220, 231, 242, 260, 273, 286, 308, 330, 363, 364, 385, 390, 420, 429, 455, 462, 484, 546, 572, 605, 660, 715, 726, 770, 780, 847, 858, 910, 924, 1001, 1092, 1155, 1210, 1365, 1430, 1452, 1540, 1573, 1694, 1716, 1815, 1820, 2002, 2145, 2310, 2420, 2541, 2730, 2860, 3003, 3146, 3388, 3630, 4004, 4235, 4290, 4620, 4719, 5005, 5082, 5460, 6006, 6292, 7260, 7865, 8470, 8580, 9438, 10010, 10164, 11011, 12012, 12705, 15015, 15730, 16940, 18876, 20020, 22022, 23595, 25410, 30030, 31460, 33033, 44044, 47190, 50820, 55055, 60060, 66066, 94380, 110110, 132132, 165165, 220220, 330330, 660660.
If you add them up, you will get the total of 660,661. Now subtract 660,660 to get 1,841,868