666522256 has 20 divisors (see below), whose sum is σ = 1293512572. Its totient is φ = 332712576.

The previous prime is 666522239. The next prime is 666522257. The reversal of 666522256 is 652225666.

It can be written as a sum of positive squares in 2 ways, for example, as 10137856 + 656384400 = 3184^2 + 25620^2 .

It is not an unprimeable number, because it can be changed into a prime (666522257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24171 + ... + 43786.

Almost surely, 2^666522256 is an apocalyptic number.

It is an amenable number.

666522256 is a deficient number, since it is larger than the sum of its proper divisors (626990316).

666522256 is a wasteful number, since it uses less digits than its factorization.

666522256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68578 (or 68572 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 666522256 is about 25817.0923227229. The cubic root of 666522256 is about 873.5173830126.

The spelling of 666522256 in words is "six hundred sixty-six million, five hundred twenty-two thousand, two hundred fifty-six".