256456775577 has 8 divisors (see below), whose sum is σ = 362056624416. Its totient is φ = 160914055232.

The previous prime is 256456775573. The next prime is 256456775591. The reversal of 256456775577 is 775577654652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256456775577 - 2² = 256456775573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256456775573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2514282063 + ... + 2514282164.

It is an arithmetic number, because the mean of its divisors is an integer number (45257078052).

Almost surely, 2^256456775577 is an apocalyptic number.

It is an amenable number.

256456775577 is a deficient number, since it is larger than the sum of its proper divisors (105599848839).

256456775577 is a wasteful number, since it uses less digits than its factorization.

256456775577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028564247.

The product of its digits is 432180000, while the sum is 66.

The spelling of 256456775577 in words is "two hundred fifty-six billion, four hundred fifty-six million, seven hundred seventy-five thousand, five hundred seventy-seven".