256253047157 has 2 divisors, whose sum is σ = 256253047158. Its totient is φ = 256253047156.

The previous prime is 256253047129. The next prime is 256253047187. The reversal of 256253047157 is 751740352652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252125498641 + 4127548516 = 502121^2 + 64246^2 .

It is a cyclic number.

It is not a de Polignac number, because 256253047157 - 2⁸ = 256253046901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256253047187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128126523578 + 128126523579.

It is an arithmetic number, because the mean of its divisors is an integer number (128126523579).

Almost surely, 2^256253047157 is an apocalyptic number.

It is an amenable number.

256253047157 is a deficient number, since it is larger than the sum of its proper divisors (1).

256253047157 is an equidigital number, since it uses as much as digits as its factorization.

256253047157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 256253047157 in words is "two hundred fifty-six billion, two hundred fifty-three million, forty-seven thousand, one hundred fifty-seven".