664904668 has 6 divisors (see below), whose sum is σ = 1163583176. Its totient is φ = 332452332.

The previous prime is 664904651. The next prime is 664904701. The reversal of 664904668 is 866409466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83113080 + ... + 83113087.

Almost surely, 2^664904668 is an apocalyptic number.

It is an amenable number.

664904668 is a deficient number, since it is larger than the sum of its proper divisors (498678508).

664904668 is a wasteful number, since it uses less digits than its factorization.

664904668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166226171 (or 166226169 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 664904668 is about 25785.7454420073. The cubic root of 664904668 is about 872.8101618938.

The spelling of 664904668 in words is "six hundred sixty-four million, nine hundred four thousand, six hundred sixty-eight".