256669994 has 8 divisors (see below), whose sum is σ = 440005728. Its totient is φ = 110001420.

The previous prime is 256669979. The next prime is 256670009. The reversal of 256669994 is 499966652.

It is an interprime number because it is at equal distance from previous prime (256669979) and next prime (256670009).

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

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, 9166772 + ... + 9166799.

It is an arithmetic number, because the mean of its divisors is an integer number (55000716).

Almost surely, 2^256669994 is an apocalyptic number.

256669994 is a deficient number, since it is larger than the sum of its proper divisors (183335734).

256669994 is a wasteful number, since it uses less digits than its factorization.

256669994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18333580.

The product of its digits is 6298560, while the sum is 56.

The square root of 256669994 is about 16020.9236313017. The cubic root of 256669994 is about 635.5138701100.

The spelling of 256669994 in words is "two hundred fifty-six million, six hundred sixty-nine thousand, nine hundred ninety-four".