Names of 66991
| Nominal | 66991 |
| Cardinal | sixty-six thousand nine hundred ninety-one |
| Ordinal | 66,991st |
| This number as US currency | sixty-six thousand nine hundred ninety-one dollars |
| Is 66991 an odd number? | 66991 is an odd number |
| Is 66991 an even number? | 66991 is NOT an even number |
| Is 66991 a palindrome? | 66991 is NOT a palindrome number |
| Is 66991 a triangle number? | 66991 is NOT a triangle number |
66991 in other Bases
| Base 2 (Binary) | 100000101101011112 |
| Base 3 (Ternary) | 101012200113 |
| Base 4 (Quaternary) | 1001122334 |
| Base 5 (Quinary) | 41204315 |
| Base 6 (Senary) | 12340516 |
| Base 8 (Octal) | 2026578 |
| Base 12 (Duodecimal) | 3292712 |
| Base 16 (Hexadecimal) | 105AF16 |
| Base 20 (Vigesimal) | 879B20 |
Primes and Factors tests for 66991
| Is 66991 a Prime Number? | 66991 is NOT a prime |
| Is 66991 a perfect number? | 66991 is NOT a perfect number |
| Is 66991 a Mersenne Prime? | 66991 is NOT a Mersenne prime |
| Is 66991 a Fermat Prime? | 66991 is NOT a Fermat prime |
| Is 66991 a Fibonacci Prime? | 66991 is NOT a Fibonacci prime |
| Is 66991 a Partition Prime? | 66991 is NOT a Partition prime |
| Is 66991 a Pell Prime? | 66991 is NOT a Pell prime |
| Prime Factors | Prime factors of 66991 |
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66991 in other Numerals
| 66991 in Roman Numeral | LXVMCMXCI |
| 66991 in Chinese Numeral | 陸萬陸仟玖佰玖拾壹 |
| 66991 in Egyptian Numeral | 𓂲𓇁𓍪𓎎𓏺 |
| 66991 in Babylonian Numeral |    |
Roots and stuff for 66991
| Is 66991 a square number? | 66991 is NOT a square number |
| Is 66991 a cube number? | 66991 is NOT a cube number |
| Square root of the number 66991 | 258.82619651032 |
| Cube root of the number 66991 | 40.613662319394 |
Recreational math for 66991
| Number 66991 reversed | 19966 |
| Sum of the digits | 31 |
| No of digits | 5 |