666424664 has 32 divisors (see below), whose sum is σ = 1291332240. Its totient is φ = 322224000.

The previous prime is 666424643. The next prime is 666424687. The reversal of 666424664 is 466424666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25154 + ... + 44334.

Almost surely, 2^666424664 is an apocalyptic number.

It is an amenable number.

666424664 is a deficient number, since it is larger than the sum of its proper divisors (624907576).

666424664 is a wasteful number, since it uses less digits than its factorization.

666424664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19331 (or 19327 counting only the distinct ones).

The product of its digits is 995328, while the sum is 44.

The square root of 666424664 is about 25815.2021878582. The cubic root of 666424664 is about 873.4747475423.

The spelling of 666424664 in words is "six hundred sixty-six million, four hundred twenty-four thousand, six hundred sixty-four".