256613677275405 has 64 divisors (see below), whose sum is σ = 432959762350080. Its totient is φ = 129426994368000.

The previous prime is 256613677275311. The next prime is 256613677275421. The reversal of 256613677275405 is 504572776316652.

It is not a de Polignac number, because 256613677275405 - 2⁹ = 256613677274893 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1594754184 + ... + 1594915086.

It is an arithmetic number, because the mean of its divisors is an integer number (6764996286720).

Almost surely, 2^{256613677275405} is an apocalyptic number.

It is an amenable number.

256613677275405 is a deficient number, since it is larger than the sum of its proper divisors (176346085074675).

256613677275405 is a wasteful number, since it uses less digits than its factorization.

256613677275405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170842.

The product of its (nonzero) digits is 444528000, while the sum is 66.

The spelling of 256613677275405 in words is "two hundred fifty-six trillion, six hundred thirteen billion, six hundred seventy-seven million, two hundred seventy-five thousand, four hundred five".