664523931 has 8 divisors (see below), whose sum is σ = 938151504. Its totient is φ = 416956160.

The previous prime is 664523927. The next prime is 664523939. The reversal of 664523931 is 139325466.

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 664523931 - 2² = 664523927 is a prime.

It is a super-2 number, since 2×664523931² = 883184109743385522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664523931.

It is not an unprimeable number, because it can be changed into a prime (664523939) 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, 6514890 + ... + 6514991.

It is an arithmetic number, because the mean of its divisors is an integer number (117268938).

Almost surely, 2^664523931 is an apocalyptic number.

664523931 is a deficient number, since it is larger than the sum of its proper divisors (273627573).

664523931 is a wasteful number, since it uses less digits than its factorization.

664523931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13029901.

The product of its digits is 116640, while the sum is 39.

The square root of 664523931 is about 25778.3616818447. The cubic root of 664523931 is about 872.6435342112.

The spelling of 664523931 in words is "six hundred sixty-four million, five hundred twenty-three thousand, nine hundred thirty-one".