Names of 66
| Nominal | 66 |
| Cardinal | sixty-six |
| Ordinal | 66th |
| This number as US currency | sixty-six dollars |
| Is 66 an odd number? | 66 is NOT an odd number |
| Is 66 an even number? | 66 is an even number |
| Is 66 a palindrome? | 66 is a palindrome number |
| Is 66 a triangle number? | 66 is a triangle number |
66 in other Bases
| Base 2 (Binary) | 10000102 |
| Base 3 (Ternary) | 21103 |
| Base 4 (Quaternary) | 10024 |
| Base 5 (Quinary) | 2315 |
| Base 6 (Senary) | 1506 |
| Base 8 (Octal) | 1028 |
| Base 12 (Duodecimal) | 5612 |
| Base 16 (Hexadecimal) | 4216 |
| Base 20 (Vigesimal) | 3620 |
Primes and Factors tests for 66
| Is 66 a Prime Number? | 66 is NOT a prime |
| Is 66 a perfect number? | 66 is NOT a perfect number |
| Is 66 a Mersenne Prime? | 66 is NOT a Mersenne prime |
| Is 66 a Fermat Prime? | 66 is NOT a Fermat prime |
| Is 66 a Fibonacci Prime? | 66 is NOT a Fibonacci prime |
| Is 66 a Partition Prime? | 66 is NOT a Partition prime |
| Is 66 a Pell Prime? | 66 is NOT a Pell prime |
| Prime Factors | Prime factors of 66 |
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66 in other Numerals
| 66 in Roman Numeral | LXVI |
| 66 in Chinese Numeral | 陸拾陸 |
| 66 in Egyptian Numeral | 𓎋𓏿 |
| 66 in Babylonian Numeral |   |
Roots and stuff for 66
| Is 66 a square number? | 66 is NOT a square number |
| Is 66 a cube number? | 66 is NOT a cube number |
| Square root of the number 66 | 8.124038404636 |
| Cube root of the number 66 | 4.0412400206222 |
Recreational math for 66
| Number 66 reversed | 66 |
| Sum of the digits | 12 |
| No of digits | 2 |