256456177 has 2 divisors, whose sum is σ = 256456178. Its totient is φ = 256456176.

The previous prime is 256456153. The next prime is 256456217. The reversal of 256456177 is 771654652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139145616 + 117310561 = 11796^2 + 10831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256456177 is a prime.

It is not a weakly prime, because it can be changed into another prime (256456147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128228088 + 128228089.

It is an arithmetic number, because the mean of its divisors is an integer number (128228089).

Almost surely, 2^256456177 is an apocalyptic number.

It is an amenable number.

256456177 is a deficient number, since it is larger than the sum of its proper divisors (1).

256456177 is an equidigital number, since it uses as much as digits as its factorization.

256456177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 256456177 is about 16014.2491862716. The cubic root of 256456177 is about 635.3373510750.

The spelling of 256456177 in words is "two hundred fifty-six million, four hundred fifty-six thousand, one hundred seventy-seven".