Names of 6661
| Nominal | 6661 |
| Cardinal | six thousand six hundred sixty-one |
| Ordinal | 6,661st |
| This number as US currency | six thousand six hundred sixty-one dollars |
| Is 6661 an odd number? | 6661 is an odd number |
| Is 6661 an even number? | 6661 is NOT an even number |
| Is 6661 a palindrome? | 6661 is NOT a palindrome number |
| Is 6661 a triangle number? | 6661 is NOT a triangle number |
6661 in other Bases
| Base 2 (Binary) | 11010000001012 |
| Base 3 (Ternary) | 1000102013 |
| Base 4 (Quaternary) | 12200114 |
| Base 5 (Quinary) | 2031215 |
| Base 6 (Senary) | 505016 |
| Base 8 (Octal) | 150058 |
| Base 12 (Duodecimal) | 3A3112 |
| Base 16 (Hexadecimal) | 1A0516 |
| Base 20 (Vigesimal) | GD120 |
Primes and Factors tests for 6661
| Is 6661 a Prime Number? | 6661 is a prime |
| Is 6661 a perfect number? | 6661 is NOT a perfect number |
| Is 6661 a Mersenne Prime? | 6661 is NOT a Mersenne prime |
| Is 6661 a Fermat Prime? | 6661 is NOT a Fermat prime |
| Is 6661 a Fibonacci Prime? | 6661 is NOT a Fibonacci prime |
| Is 6661 a Partition Prime? | 6661 is NOT a Partition prime |
| Is 6661 a Pell Prime? | 6661 is NOT a Pell prime |
| Prime Factors | Prime factors of 6661 |
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6661 in other Numerals
| 6661 in Roman Numeral | VMDCLXI |
| 6661 in Chinese Numeral | 陸仟陸佰陸拾壹 |
| 6661 in Egyptian Numeral | 𓇁𓍧𓎋𓏺 |
| 6661 in Babylonian Numeral |   |
Roots and stuff for 6661
| Is 6661 a square number? | 6661 is NOT a square number |
| Is 6661 a cube number? | 6661 is NOT a cube number |
| Square root of the number 6661 | 81.614949610963 |
| Cube root of the number 6661 | 18.815386528524 |
Recreational math for 6661
| Number 6661 reversed | 1666 |
| Sum of the digits | 19 |
| No of digits | 4 |