256664422 has 8 divisors (see below), whose sum is σ = 439996176. Its totient is φ = 109999032.

The previous prime is 256664417. The next prime is 256664437. The reversal of 256664422 is 224466652.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 9166573 + ... + 9166600.

It is an arithmetic number, because the mean of its divisors is an integer number (54999522).

Almost surely, 2^256664422 is an apocalyptic number.

256664422 is a deficient number, since it is larger than the sum of its proper divisors (183331754).

256664422 is a wasteful number, since it uses less digits than its factorization.

256664422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18333182.

The product of its digits is 138240, while the sum is 37.

The square root of 256664422 is about 16020.7497327684. The cubic root of 256664422 is about 635.5092713268.

The spelling of 256664422 in words is "two hundred fifty-six million, six hundred sixty-four thousand, four hundred twenty-two".