Compare 1660 vs 1661
| Property | 1660 | 1661 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 22 × 51 × 831 | 111 × 1511 |
| Prime factorization | 2 × 2 × 5 × 83 | 11 × 151 |
| Divisors count | 12 | 4 |
| Divisors | 1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660 | 1, 11, 151, 1661 |
| Number of properties | 0 | 1 |
| Semiprimes | 479th | |
| Roman numberals | MDCLX | MDCLXI |
| Base 2 | 110011111002 | 110011111012 |
| Base 3 | 20211113 | 20211123 |
| Base 4 | 1213304 | 1213314 |
| Base 5 | 231205 | 231215 |
| Base 6 | 114046 | 114056 |
| Base 7 | 45617 | 45627 |
| Base 8 | 31748 | 31758 |
| Base 9 | 22449 | 22459 |
| Base 10 | 166010 | 166110 |
| Base 11 | 127a11 | 128011 |
| Base 12 | b6412 | b6512 |
| Base 13 | 9a913 | 9aa13 |
| Base 14 | 86814 | 86914 |
| Base 15 | 75a15 | 75b15 |
| Base 16 | 67c16 | 67d16 |