256266436157 has 2 divisors, whose sum is σ = 256266436158. Its totient is φ = 256266436156.

The previous prime is 256266436141. The next prime is 256266436159. The reversal of 256266436157 is 751634662652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204219032836 + 52047403321 = 451906^2 + 228139^2 .

It is a cyclic number.

It is not a de Polignac number, because 256266436157 - 2⁴ = 256266436141 is a prime.

Together with 256266436159, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256266436099 and 256266436108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256266436159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128133218078 + 128133218079.

It is an arithmetic number, because the mean of its divisors is an integer number (128133218079).

Almost surely, 2^256266436157 is an apocalyptic number.

It is an amenable number.

256266436157 is a deficient number, since it is larger than the sum of its proper divisors (1).

256266436157 is an equidigital number, since it uses as much as digits as its factorization.

256266436157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 53.

The spelling of 256266436157 in words is "two hundred fifty-six billion, two hundred sixty-six million, four hundred thirty-six thousand, one hundred fifty-seven".