256316364421 has 4 divisors (see below), whose sum is σ = 276033007852. Its totient is φ = 236599720992.

The previous prime is 256316364413. The next prime is 256316364461. The reversal of 256316364421 is 124463613652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74340749025 + 181975615396 = 272655^2 + 426586^2 .

It is a cyclic number.

It is not a de Polignac number, because 256316364421 - 2³ = 256316364413 is a prime.

It is a super-4 number, since 4×256316364421⁴ (a number of 47 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256316364401) 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, 9858321696 + ... + 9858321721.

It is an arithmetic number, because the mean of its divisors is an integer number (69008251963).

Almost surely, 2^256316364421 is an apocalyptic number.

It is an amenable number.

256316364421 is a deficient number, since it is larger than the sum of its proper divisors (19716643431).

256316364421 is a wasteful number, since it uses less digits than its factorization.

256316364421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19716643430.

The product of its digits is 622080, while the sum is 43.

The spelling of 256316364421 in words is "two hundred fifty-six billion, three hundred sixteen million, three hundred sixty-four thousand, four hundred twenty-one".