256279074677 has 2 divisors, whose sum is σ = 256279074678. Its totient is φ = 256279074676.

The previous prime is 256279074647. The next prime is 256279074767. The reversal of 256279074677 is 776470972652.

Together with next prime (256279074767) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131420025361 + 124859049316 = 362519^2 + 353354^2 .

It is a cyclic number.

It is not a de Polignac number, because 256279074677 - 2²⁰ = 256278026101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256279074607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128139537338 + 128139537339.

It is an arithmetic number, because the mean of its divisors is an integer number (128139537339).

Almost surely, 2^256279074677 is an apocalyptic number.

It is an amenable number.

256279074677 is a deficient number, since it is larger than the sum of its proper divisors (1).

256279074677 is an equidigital number, since it uses as much as digits as its factorization.

256279074677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62233920, while the sum is 62.

The spelling of 256279074677 in words is "two hundred fifty-six billion, two hundred seventy-nine million, seventy-four thousand, six hundred seventy-seven".