256621527131371 has 4 divisors (see below), whose sum is σ = 270127923296200. Its totient is φ = 243115130966544.

The previous prime is 256621527131329. The next prime is 256621527131377. The reversal of 256621527131371 is 173131725126652.

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

It is a cyclic number.

It is not a de Polignac number, because 256621527131371 - 2¹⁷ = 256621527000299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256621527131377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6753198082386 + ... + 6753198082423.

It is an arithmetic number, because the mean of its divisors is an integer number (67531980824050).

Almost surely, 2^{256621527131371} is an apocalyptic number.

256621527131371 is a deficient number, since it is larger than the sum of its proper divisors (13506396164829).

256621527131371 is a wasteful number, since it uses less digits than its factorization.

256621527131371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13506396164828.

The product of its digits is 3175200, while the sum is 52.

The spelling of 256621527131371 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, five hundred twenty-seven million, one hundred thirty-one thousand, three hundred seventy-one".