256682591155 has 16 divisors (see below), whose sum is σ = 317664129024. Its totient is φ = 198991265760.

The previous prime is 256682591153. The next prime is 256682591261. The reversal of 256682591155 is 551195286652.

It is not a de Polignac number, because 256682591155 - 2¹ = 256682591153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256682591096 and 256682591105.

It is not an unprimeable number, because it can be changed into a prime (256682591153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4672981 + ... + 4727590.

It is an arithmetic number, because the mean of its divisors is an integer number (19854008064).

Almost surely, 2^256682591155 is an apocalyptic number.

256682591155 is a deficient number, since it is larger than the sum of its proper divisors (60981537869).

256682591155 is a wasteful number, since it uses less digits than its factorization.

256682591155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400746.

The product of its digits is 6480000, while the sum is 55.

The spelling of 256682591155 in words is "two hundred fifty-six billion, six hundred eighty-two million, five hundred ninety-one thousand, one hundred fifty-five".