66
Everything about the number 66 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 66
| Nominal | 66 |
| Cardinal | sixty-six |
| Ordinal | 66th |
| This number as US currency | sixty-six dollars |
Properties (and some facts) of 66
| 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 |
| Is 66 a triangle number? | 66 is a triangle number |
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66 in other bases
| Base 2 (Binary) | 1000010 |
| Base 3 (Ternary) | 2110 |
| Base 4 (Quaternary) | 1002 |
| Base 5 (Quinary) | 231 |
| Base 6 (Senary) | 150 |
| Base 8 (Octal) | 102 |
| Base 12 (Duodecimal) | 56 |
| Base 16 (Hexadecimal) | 42 |
| Base 20 (Vigesimal) | 36 |
Primes and factors tests for 66
| Is 66 a prime number? | 66 is not a prime number |
| 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 |
66 in other numeral systems
| 66 in Roman numerals | LXVI |
| 66 in Chinese numerals | 陸拾陸 |
| 66 in Babylonian numerals |   |
| 66 in Egyptian numerals | 𓎋𓏿 |
Roots and squares 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 66 | 8.124038404636 |
| Cube root of 66 | 4.0412400206222 |
Recreational math for 66
| Number 66 reversed | 66 |
| Sum of the digits | 12 |
| Number of digits | 2 |
Arithmetic tables for 66
Other pages about 66
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