664663256 has 16 divisors (see below), whose sum is σ = 1251595800. Its totient is φ = 330904384.

The previous prime is 664663217. The next prime is 664663271. The reversal of 664663256 is 652366466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176426 + ... + 180153.

Almost surely, 2^664663256 is an apocalyptic number.

It is an amenable number.

664663256 is a deficient number, since it is larger than the sum of its proper divisors (586932544).

664663256 is a wasteful number, since it uses less digits than its factorization.

664663256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356818 (or 356814 counting only the distinct ones).

The product of its digits is 933120, while the sum is 44.

The square root of 664663256 is about 25781.0639035708. The cubic root of 664663256 is about 872.7045164968.

The spelling of 664663256 in words is "six hundred sixty-four million, six hundred sixty-three thousand, two hundred fifty-six".