256713043291 has 2 divisors, whose sum is σ = 256713043292. Its totient is φ = 256713043290.

The previous prime is 256713043261. The next prime is 256713043343. The reversal of 256713043291 is 192340317652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256713043291 - 2⁷ = 256713043163 is a prime.

It is a super-2 number, since 2×256713043291² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256713043231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128356521645 + 128356521646.

It is an arithmetic number, because the mean of its divisors is an integer number (128356521646).

Almost surely, 2^256713043291 is an apocalyptic number.

256713043291 is a deficient number, since it is larger than the sum of its proper divisors (1).

256713043291 is an equidigital number, since it uses as much as digits as its factorization.

256713043291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 256713043291 in words is "two hundred fifty-six billion, seven hundred thirteen million, forty-three thousand, two hundred ninety-one".