664630506 has 12 divisors (see below), whose sum is σ = 1440032802. Its totient is φ = 221543496.

The previous prime is 664630493. The next prime is 664630511. The reversal of 664630506 is 605036466.

664630506 is a `hidden beast` number, since 6 + 646 + 3 + 0 + 5 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 422672481 + 241958025 = 20559^2 + 15555^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18461941 + ... + 18461976.

Almost surely, 2^664630506 is an apocalyptic number.

664630506 is an abundant number, since it is smaller than the sum of its proper divisors (775402296).

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

664630506 is a wasteful number, since it uses less digits than its factorization.

664630506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36923925 (or 36923922 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 664630506 is about 25780.4287396467. The cubic root of 664630506 is about 872.6901826508.

The spelling of 664630506 in words is "six hundred sixty-four million, six hundred thirty thousand, five hundred six".