Compare 1661 vs 1664
| Property | 1661 | 1664 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 8 |
| Prime factorization | 111 × 1511 | 27 × 131 |
| Prime factorization | 11 × 151 | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 13 |
| Divisors count | 4 | 16 |
| Divisors | 1, 11, 151, 1661 | 1, 2, 4, 8, 13, 16, 26, 32, 52, 64, 104, 128, 208, 416, 832, 1664 |
| Number of properties | 1 | 0 |
| Semiprimes | 479th | |
| Roman numberals | MDCLXI | MDCLXIV |
| Base 2 | 110011111012 | 110100000002 |
| Base 3 | 20211123 | 20211223 |
| Base 4 | 1213314 | 1220004 |
| Base 5 | 231215 | 231245 |
| Base 6 | 114056 | 114126 |
| Base 7 | 45627 | 45657 |
| Base 8 | 31758 | 32008 |
| Base 9 | 22459 | 22489 |
| Base 10 | 166110 | 166410 |
| Base 11 | 128011 | 128311 |
| Base 12 | b6512 | b6812 |
| Base 13 | 9aa13 | 9b013 |
| Base 14 | 86914 | 86c14 |
| Base 15 | 75b15 | 75e15 |
| Base 16 | 67d16 | 68016 |