664466556 has 96 divisors (see below), whose sum is σ = 1861090560. Its totient is φ = 182283264.

The previous prime is 664466533. The next prime is 664466563. The reversal of 664466556 is 655664466.

It is a happy number.

It is a super-2 number, since 2×664466556² = 883031608085002272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43795 + ... + 56981.

It is an arithmetic number, because the mean of its divisors is an integer number (19386360).

Almost surely, 2^664466556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664466556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930545280).

664466556 is an abundant number, since it is smaller than the sum of its proper divisors (1196624004).

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

664466556 is a wasteful number, since it uses less digits than its factorization.

664466556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243 (or 13241 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 48.

The square root of 664466556 is about 25777.2488058753. The cubic root of 664466556 is about 872.6184188058.

The spelling of 664466556 in words is "six hundred sixty-four million, four hundred sixty-six thousand, five hundred fifty-six".