256679771795 has 4 divisors (see below), whose sum is σ = 308015726160. Its totient is φ = 205343817432.

The previous prime is 256679771791. The next prime is 256679771797. The reversal of 256679771795 is 597177976652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256679771795 - 2² = 256679771791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256679771791) 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 in 3 ways as a sum of consecutive naturals, for example, 25667977175 + ... + 25667977184.

It is an arithmetic number, because the mean of its divisors is an integer number (77003931540).

Almost surely, 2^256679771795 is an apocalyptic number.

256679771795 is a deficient number, since it is larger than the sum of its proper divisors (51335954365).

256679771795 is an equidigital number, since it uses as much as digits as its factorization.

256679771795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51335954364.

The product of its digits is 350065800, while the sum is 71.

The spelling of 256679771795 in words is "two hundred fifty-six billion, six hundred seventy-nine million, seven hundred seventy-one thousand, seven hundred ninety-five".