256726343630445 has 128 divisors (see below), whose sum is σ = 482246455541760. Its totient is φ = 115538202178560.

The previous prime is 256726343630377. The next prime is 256726343630453. The reversal of 256726343630445 is 544036343627652.

It is not a de Polignac number, because 256726343630445 - 2¹⁵ = 256726343597677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1981227 + ... + 22745943.

It is an arithmetic number, because the mean of its divisors is an integer number (3767550433920).

Almost surely, 2^{256726343630445} is an apocalyptic number.

It is an amenable number.

256726343630445 is a deficient number, since it is larger than the sum of its proper divisors (225520111911315).

256726343630445 is a wasteful number, since it uses less digits than its factorization.

256726343630445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20764875.

The product of its (nonzero) digits is 261273600, while the sum is 60.

The spelling of 256726343630445 in words is "two hundred fifty-six trillion, seven hundred twenty-six billion, three hundred forty-three million, six hundred thirty thousand, four hundred forty-five".