Everything about the number 1664001 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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| Nominal | 1664001 |
| Cardinal | one million six hundred sixty-four thousand one |
| Ordinal | 1,664,001st |
| This number as US currency | one million six hundred sixty-four thousand one dollars |
| Is 1664001 an odd number? | 1664001 is an odd number |
| Is 1664001 an even number? | 1664001 is not an even number |
| Is 1664001 a palindrome? | 1664001 is not a palindrome |
| Is 1664001 a triangle number? | 1664001 is not a triangle number |
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| Base 2 (Binary) | 110010110010000000001 |
| Base 3 (Ternary) | 10010112120200 |
| Base 4 (Quaternary) | 12112100001 |
| Base 5 (Quinary) | 411222001 |
| Base 6 (Senary) | 55355413 |
| Base 8 (Octal) | 6262001 |
| Base 12 (Duodecimal) | 682B69 |
| Base 16 (Hexadecimal) | 196401 |
| Base 20 (Vigesimal) | A8001 |
| Is 1664001 a prime number? | 1664001 is not a prime number |
| Is 1664001 a perfect number? | 1664001 is not a perfect number |
| Is 1664001 a Mersenne prime? | 1664001 is not a Mersenne prime |
| Is 1664001 a Fermat prime? | 1664001 is not a Fermat prime |
| Is 1664001 a Fibonacci prime? | 1664001 is not a Fibonacci prime |
| Is 1664001 a partition prime? | 1664001 is not a partition prime |
| Is 1664001 a Pell prime? | 1664001 is not a Pell prime |
| Prime Factors | Prime factors of 1664001 |
| 1664001 in Roman numerals | DCLXMVI |
| 1664001 in Chinese numerals | 陸拾萬陸萬肆仟壹 |
| 1664001 in Babylonian numerals | ![]() |
| 1664001 in Egyptian numerals | 𓁨𓆐𓆐𓆐𓆐𓆐𓆐𓂲𓆿𓏺 |
| Is 1664001 a square number? | 1664001 is not a square number |
| Is 1664001 a cube number? | 1664001 is not a cube number |
| Square root of 1664001 | 1289.9616273363 |
| Cube root of 1664001 | 118.49986647424 |
| Number 1664001 reversed | 1004661 |
| Sum of the digits | 18 |
| Number of digits | 7 |
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