Names of 669
| Nominal | 669 |
| Cardinal | six hundred sixty-nine |
| Ordinal | 669th |
| This number as US currency | six hundred sixty-nine dollars |
| Is 669 an odd number? | 669 is an odd number |
| Is 669 an even number? | 669 is NOT an even number |
| Is 669 a palindrome? | 669 is NOT a palindrome number |
| Is 669 a triangle number? | 669 is NOT a triangle number |
669 in other Bases
| Base 2 (Binary) | 10100111012 |
| Base 3 (Ternary) | 2202103 |
| Base 4 (Quaternary) | 221314 |
| Base 5 (Quinary) | 101345 |
| Base 6 (Senary) | 30336 |
| Base 8 (Octal) | 12358 |
| Base 12 (Duodecimal) | 47912 |
| Base 16 (Hexadecimal) | 29D16 |
| Base 20 (Vigesimal) | 1D920 |
Primes and Factors tests for 669
| Is 669 a Prime Number? | 669 is NOT a prime |
| Is 669 a perfect number? | 669 is NOT a perfect number |
| Is 669 a Mersenne Prime? | 669 is NOT a Mersenne prime |
| Is 669 a Fermat Prime? | 669 is NOT a Fermat prime |
| Is 669 a Fibonacci Prime? | 669 is NOT a Fibonacci prime |
| Is 669 a Partition Prime? | 669 is NOT a Partition prime |
| Is 669 a Pell Prime? | 669 is NOT a Pell prime |
| Prime Factors | Prime factors of 669 |
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669 in other Numerals
| 669 in Roman Numeral | DCLXIX |
| 669 in Chinese Numeral | 陸佰陸拾玖 |
| 669 in Egyptian Numeral | 𓍧𓎋𓐂 |
| 669 in Babylonian Numeral |   |
Roots and stuff for 669
| Is 669 a square number? | 669 is NOT a square number |
| Is 669 a cube number? | 669 is NOT a cube number |
| Square root of the number 669 | 25.865034312755 |
| Cube root of the number 669 | 8.7459845521172 |
Recreational math for 669
| Number 669 reversed | 966 |
| Sum of the digits | 21 |
| No of digits | 3 |