256774696579 has 2 divisors, whose sum is σ = 256774696580. Its totient is φ = 256774696578.

The previous prime is 256774696501. The next prime is 256774696621. The reversal of 256774696579 is 975696477652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256774696579 is a prime.

It is not a weakly prime, because it can be changed into another prime (256774696879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128387348289 + 128387348290.

It is an arithmetic number, because the mean of its divisors is an integer number (128387348290).

Almost surely, 2^256774696579 is an apocalyptic number.

256774696579 is a deficient number, since it is larger than the sum of its proper divisors (1).

256774696579 is an equidigital number, since it uses as much as digits as its factorization.

256774696579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200225600, while the sum is 73.

The spelling of 256774696579 in words is "two hundred fifty-six billion, seven hundred seventy-four million, six hundred ninety-six thousand, five hundred seventy-nine".