Compare 1666 vs 1669
| Property | 1666 | 1669 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 21 × 72 × 171 | 16691 |
| Prime factorization | 2 × 7 × 7 × 17 | 1669 |
| Divisors count | 12 | 2 |
| Divisors | 1, 2, 7, 14, 17, 34, 49, 98, 119, 238, 833, 1666 | 1, 1669 |
| Number of properties | 0 | 9 |
| Chen primes | 166th | |
| Emirps | 81st | |
| Primes | 263rd | |
| Prime triplets (3rd member) | 43rd | |
| Pythagorean primes | 126th | |
| Sexy primes (2nd member) | 113th | |
| Sexy prime triplets (3rd member) | 43rd | |
| Super primes | 56th | |
| Twin primes (2nd member) | 53rd | |
| Roman numberals | MDCLXVI | MDCLXIX |
| Base 2 | 110100000102 | 110100001012 |
| Base 3 | 20212013 | 20212113 |
| Base 4 | 1220024 | 1220114 |
| Base 5 | 231315 | 231345 |
| Base 6 | 114146 | 114216 |
| Base 7 | 46007 | 46037 |
| Base 8 | 32028 | 32058 |
| Base 9 | 22519 | 22549 |
| Base 10 | 166610 | 166910 |
| Base 11 | 128511 | 128811 |
| Base 12 | b6a12 | b7112 |
| Base 13 | 9b213 | 9b513 |
| Base 14 | 87014 | 87314 |
| Base 15 | 76115 | 76415 |
| Base 16 | 68216 | 68516 |