256691511724259 has 2 divisors, whose sum is σ = 256691511724260. Its totient is φ = 256691511724258.

The previous prime is 256691511724253. The next prime is 256691511724279. The reversal of 256691511724259 is 952427115196652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256691511724259 - 2²⁸ = 256691243288803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256691511724195 and 256691511724204.

It is not a weakly prime, because it can be changed into another prime (256691511724253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128345755862129 + 128345755862130.

It is an arithmetic number, because the mean of its divisors is an integer number (128345755862130).

Almost surely, 2^{256691511724259} is an apocalyptic number.

256691511724259 is a deficient number, since it is larger than the sum of its proper divisors (1).

256691511724259 is an equidigital number, since it uses as much as digits as its factorization.

256691511724259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648000, while the sum is 65.

The spelling of 256691511724259 in words is "two hundred fifty-six trillion, six hundred ninety-one billion, five hundred eleven million, seven hundred twenty-four thousand, two hundred fifty-nine".