663665256 has 48 divisors (see below), whose sum is σ = 1814897760. Its totient is φ = 219071520.

The previous prime is 663665251. The next prime is 663665273. The reversal of 663665256 is 652566366.

663665256 is a `hidden beast` number, since 6 + 63 + 66 + 525 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (663665251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37330 + ... + 52161.

It is an arithmetic number, because the mean of its divisors is an integer number (37810370).

Almost surely, 2^663665256 is an apocalyptic number.

It is an amenable number.

663665256 is an abundant number, since it is smaller than the sum of its proper divisors (1151232504).

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

663665256 is a wasteful number, since it uses less digits than its factorization.

663665256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89606 (or 89599 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The square root of 663665256 is about 25761.7013413323. The cubic root of 663665256 is about 872.2675055332.

The spelling of 663665256 in words is "six hundred sixty-three million, six hundred sixty-five thousand, two hundred fifty-six".