Names of 668
| Nominal | 668 |
| Cardinal | six hundred sixty-eight |
| Ordinal | 668th |
| This number as US currency | six hundred sixty-eight dollars |
| Is 668 an odd number? | 668 is NOT an odd number |
| Is 668 an even number? | 668 is an even number |
| Is 668 a palindrome? | 668 is NOT a palindrome number |
| Is 668 a triangle number? | 668 is NOT a triangle number |
668 in other Bases
| Base 2 (Binary) | 10100111002 |
| Base 3 (Ternary) | 2202023 |
| Base 4 (Quaternary) | 221304 |
| Base 5 (Quinary) | 101335 |
| Base 6 (Senary) | 30326 |
| Base 8 (Octal) | 12348 |
| Base 12 (Duodecimal) | 47812 |
| Base 16 (Hexadecimal) | 29C16 |
| Base 20 (Vigesimal) | 1D820 |
Primes and Factors tests for 668
| Is 668 a Prime Number? | 668 is NOT a prime |
| Is 668 a perfect number? | 668 is NOT a perfect number |
| Is 668 a Mersenne Prime? | 668 is NOT a Mersenne prime |
| Is 668 a Fermat Prime? | 668 is NOT a Fermat prime |
| Is 668 a Fibonacci Prime? | 668 is NOT a Fibonacci prime |
| Is 668 a Partition Prime? | 668 is NOT a Partition prime |
| Is 668 a Pell Prime? | 668 is NOT a Pell prime |
| Prime Factors | Prime factors of 668 |
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668 in other Numerals
| 668 in Roman Numeral | DCLXVIII |
| 668 in Chinese Numeral | 陸佰陸拾捌 |
| 668 in Egyptian Numeral | 𓍧𓎋𓐁 |
| 668 in Babylonian Numeral |   |
Roots and stuff for 668
| Is 668 a square number? | 668 is NOT a square number |
| Is 668 a cube number? | 668 is NOT a cube number |
| Square root of the number 668 | 25.84569596664 |
| Cube root of the number 668 | 8.7416246388563 |
Recreational math for 668
| Number 668 reversed | 866 |
| Sum of the digits | 20 |
| No of digits | 3 |