66666256 has 10 divisors (see below), whose sum is σ = 129165902. Its totient is φ = 33333120.

The previous prime is 66666247. The next prime is 66666263. The reversal of 66666256 is 65266666.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 80656 = 8160^2 + 284^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2083305 + ... + 2083336.

Almost surely, 2^66666256 is an apocalyptic number.

It is an amenable number.

66666256 is a deficient number, since it is larger than the sum of its proper divisors (62499646).

66666256 is a wasteful number, since it uses less digits than its factorization.

66666256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166649 (or 4166643 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 66666256 is about 8164.9406611438. The cubic root of 66666256 is about 405.4793004506.

The spelling of 66666256 in words is "sixty-six million, six hundred sixty-six thousand, two hundred fifty-six".