664075664 has 40 divisors (see below), whose sum is σ = 1476238848. Its totient is φ = 283484160.

The previous prime is 664075663. The next prime is 664075681. The reversal of 664075664 is 466570466.

It is not an unprimeable number, because it can be changed into a prime (664075661) 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, 17249 + ... + 40319.

Almost surely, 2^664075664 is an apocalyptic number.

It is an amenable number.

664075664 is an abundant number, since it is smaller than the sum of its proper divisors (812163184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664075664 is a wasteful number, since it uses less digits than its factorization.

664075664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23343 (or 23337 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 664075664 is about 25769.6655779620. The cubic root of 664075664 is about 872.4472707548.

The spelling of 664075664 in words is "six hundred sixty-four million, seventy-five thousand, six hundred sixty-four".