256691511724279 has 2 divisors, whose sum is σ = 256691511724280. Its totient is φ = 256691511724278.

The previous prime is 256691511724259. The next prime is 256691511724283. The reversal of 256691511724279 is 972427115196652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256691511724279 - 2³³ = 256682921789687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256691511724259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128345755862139 + 128345755862140.

It is an arithmetic number, because the mean of its divisors is an integer number (128345755862140).

Almost surely, 2^{256691511724279} is an apocalyptic number.

256691511724279 is a deficient number, since it is larger than the sum of its proper divisors (1).

256691511724279 is an equidigital number, since it uses as much as digits as its factorization.

256691511724279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114307200, while the sum is 67.

The spelling of 256691511724279 in words is "two hundred fifty-six trillion, six hundred ninety-one billion, five hundred eleven million, seven hundred twenty-four thousand, two hundred seventy-nine".