256621527152677 has 8 divisors (see below), whose sum is σ = 257463641635200. Its totient is φ = 255779453019744.

The previous prime is 256621527152663. The next prime is 256621527152707. The reversal of 256621527152677 is 776251725126652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256621527152677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256621527152777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2679849 + ... + 22812817.

It is an arithmetic number, because the mean of its divisors is an integer number (32182955204400).

Almost surely, 2^{256621527152677} is an apocalyptic number.

It is an amenable number.

256621527152677 is a deficient number, since it is larger than the sum of its proper divisors (842114482523).

256621527152677 is a wasteful number, since it uses less digits than its factorization.

256621527152677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20174795.

The product of its digits is 148176000, while the sum is 64.

The spelling of 256621527152677 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, five hundred twenty-seven million, one hundred fifty-two thousand, six hundred seventy-seven".