664957801 has 8 divisors (see below), whose sum is σ = 702864800. Its totient is φ = 627341760.

The previous prime is 664957793. The next prime is 664957823. The reversal of 664957801 is 108759466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664957801 - 2³ = 664957793 is a prime.

It is a super-2 number, since 2×664957801² = 884337754221511202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664957861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68031 + ... + 77188.

It is an arithmetic number, because the mean of its divisors is an integer number (87858100).

Almost surely, 2^664957801 is an apocalyptic number.

It is an amenable number.

664957801 is a deficient number, since it is larger than the sum of its proper divisors (37906999).

664957801 is a wasteful number, since it uses less digits than its factorization.

664957801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145479.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 664957801 is about 25786.7756999591. The cubic root of 664957801 is about 872.8334102327.

The spelling of 664957801 in words is "six hundred sixty-four million, nine hundred fifty-seven thousand, eight hundred one".