666001
Everything about the number 666001 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
Names of 666001
| Nominal | 666001 |
| Cardinal | six hundred sixty-six thousand one |
| Ordinal | 666,001st |
| This number as US currency | six hundred sixty-six thousand one dollars |
Properties (and some facts) of 666001
| Is 666001 an odd number? | 666001 is an odd number |
| Is 666001 an even number? | 666001 is not an even number |
| Is 666001 a palindrome? | 666001 is not a palindrome |
| Is 666001 a triangle number? | 666001 is not a triangle number |
666001 in other bases
| Base 2 (Binary) | 10100010100110010001 |
| Base 3 (Ternary) | 1020211120201 |
| Base 4 (Quaternary) | 2202212101 |
| Base 5 (Quinary) | 132303001 |
| Base 6 (Senary) | 22135201 |
| Base 8 (Octal) | 2424621 |
| Base 12 (Duodecimal) | 281501 |
| Base 16 (Hexadecimal) | A2991 |
| Base 20 (Vigesimal) | 43501 |
Primes and factors tests for 666001
| Is 666001 a prime number? | 666001 is not a prime number |
| Is 666001 a perfect number? | 666001 is not a perfect number |
| Is 666001 a Mersenne prime? | 666001 is not a Mersenne prime |
| Is 666001 a Fermat prime? | 666001 is not a Fermat prime |
| Is 666001 a Fibonacci prime? | 666001 is not a Fibonacci prime |
| Is 666001 a partition prime? | 666001 is not a partition prime |
| Is 666001 a Pell prime? | 666001 is not a Pell prime |
| Prime Factors | Prime factors of 666001 |
666001 in other numeral systems
| 666001 in Roman numerals | DCLXVMI |
| 666001 in Chinese numerals | 陸拾萬陸萬陸仟壹 |
| 666001 in Babylonian numerals |    |
| 666001 in Egyptian numerals | 𓆐𓆐𓆐𓆐𓆐𓆐𓂲𓇁𓏺 |
Roots and squares for 666001
| Is 666001 a square number? | 666001 is not a square number |
| Is 666001 a cube number? | 666001 is not a cube number |
| Square root of 666001 | 816.08884320275 |
| Cube root of 666001 | 87.328961121105 |
Recreational math for 666001
| Number 666001 reversed | 100666 |
| Sum of the digits | 19 |
| Number of digits | 6 |