256255055170521 has 8 divisors (see below), whose sum is σ = 372734625702624. Its totient is φ = 155306094042720.

The previous prime is 256255055170489. The next prime is 256255055170537. The reversal of 256255055170521 is 125071550552652.

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

It is not a de Polignac number, because 256255055170521 - 2⁵ = 256255055170489 is a prime.

It is a super-2 number, since 2×256255055170521² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256255055170421) 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, 3882652351036 + ... + 3882652351101.

It is an arithmetic number, because the mean of its divisors is an integer number (46591828212828).

Almost surely, 2^{256255055170521} is an apocalyptic number.

It is an amenable number.

256255055170521 is a deficient number, since it is larger than the sum of its proper divisors (116479570532103).

256255055170521 is a wasteful number, since it uses less digits than its factorization.

256255055170521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7765304702151.

The product of its (nonzero) digits is 5250000, while the sum is 51.

The spelling of 256255055170521 in words is "two hundred fifty-six trillion, two hundred fifty-five billion, fifty-five million, one hundred seventy thousand, five hundred twenty-one".