256159318656531 has 32 divisors (see below), whose sum is σ = 345620972736000. Its totient is φ = 168742706033664.

The previous prime is 256159318656529. The next prime is 256159318656611. The reversal of 256159318656531 is 135656813951652.

It is not a de Polignac number, because 256159318656531 - 2¹ = 256159318656529 is a prime.

It is a super-2 number, since 2×256159318656531² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256159318656511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 794385025 + ... + 794707421.

It is an arithmetic number, because the mean of its divisors is an integer number (10800655398000).

Almost surely, 2^{256159318656531} is an apocalyptic number.

256159318656531 is a deficient number, since it is larger than the sum of its proper divisors (89461654079469).

256159318656531 is a wasteful number, since it uses less digits than its factorization.

256159318656531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328155.

The product of its digits is 174960000, while the sum is 66.

The spelling of 256159318656531 in words is "two hundred fifty-six trillion, one hundred fifty-nine billion, three hundred eighteen million, six hundred fifty-six thousand, five hundred thirty-one".