Names of 1666
| Nominal | 1666 |
| Cardinal | one thousand six hundred sixty-six |
| Ordinal | 1,666th |
| This number as US currency | one thousand six hundred sixty-six dollars |
| Is 1666 an odd number? | 1666 is NOT an odd number |
| Is 1666 an even number? | 1666 is an even number |
| Is 1666 a palindrome? | 1666 is NOT a palindrome number |
| Is 1666 a triangle number? | 1666 is NOT a triangle number |
1666 in other Bases
| Base 2 (Binary) | 110100000102 |
| Base 3 (Ternary) | 20212013 |
| Base 4 (Quaternary) | 1220024 |
| Base 5 (Quinary) | 231315 |
| Base 6 (Senary) | 114146 |
| Base 8 (Octal) | 32028 |
| Base 12 (Duodecimal) | B6A12 |
| Base 16 (Hexadecimal) | 68216 |
| Base 20 (Vigesimal) | 43620 |
Primes and Factors tests for 1666
| Is 1666 a Prime Number? | 1666 is NOT a prime |
| Is 1666 a perfect number? | 1666 is NOT a perfect number |
| Is 1666 a Mersenne Prime? | 1666 is NOT a Mersenne prime |
| Is 1666 a Fermat Prime? | 1666 is NOT a Fermat prime |
| Is 1666 a Fibonacci Prime? | 1666 is NOT a Fibonacci prime |
| Is 1666 a Partition Prime? | 1666 is NOT a Partition prime |
| Is 1666 a Pell Prime? | 1666 is NOT a Pell prime |
| Prime Factors | Prime factors of 1666 |
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1666 in other Numerals
| 1666 in Roman Numeral | MDCLXVI |
| 1666 in Chinese Numeral | 壹仟陸佰陸拾陸 |
| 1666 in Egyptian Numeral | 𓆼𓍧𓎋𓏿 |
| 1666 in Babylonian Numeral |   |
Roots and stuff for 1666
| Is 1666 a square number? | 1666 is NOT a square number |
| Is 1666 a cube number? | 1666 is NOT a cube number |
| Square root of the number 1666 | 40.816663263917 |
| Cube root of the number 1666 | 11.854729962672 |
Recreational math for 1666
| Number 1666 reversed | 6661 |
| Sum of the digits | 19 |
| No of digits | 4 |