256331680517 has 8 divisors (see below), whose sum is σ = 284218734432. Its totient is φ = 229208655600.

The previous prime is 256331680513. The next prime is 256331680541. The reversal of 256331680517 is 715086133652.

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

It is a cyclic number.

It is not a de Polignac number, because 256331680517 - 2² = 256331680513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256331680513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191006543 + ... + 191007884.

It is an arithmetic number, because the mean of its divisors is an integer number (35527341804).

Almost surely, 2^256331680517 is an apocalyptic number.

It is an amenable number.

256331680517 is a deficient number, since it is larger than the sum of its proper divisors (27887053915).

256331680517 is a wasteful number, since it uses less digits than its factorization.

256331680517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382014499.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 256331680517 in words is "two hundred fifty-six billion, three hundred thirty-one million, six hundred eighty thousand, five hundred seventeen".