257115468391 has 2 divisors, whose sum is σ = 257115468392. Its totient is φ = 257115468390.

The previous prime is 257115468373. The next prime is 257115468413. The reversal of 257115468391 is 193864511752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257115468391 - 2¹¹ = 257115466343 is a prime.

It is a super-2 number, since 2×257115468391² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257115468331) 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 as a sum of consecutive naturals, namely, 128557734195 + 128557734196.

It is an arithmetic number, because the mean of its divisors is an integer number (128557734196).

Almost surely, 2^257115468391 is an apocalyptic number.

257115468391 is a deficient number, since it is larger than the sum of its proper divisors (1).

257115468391 is an equidigital number, since it uses as much as digits as its factorization.

257115468391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The spelling of 257115468391 in words is "two hundred fifty-seven billion, one hundred fifteen million, four hundred sixty-eight thousand, three hundred ninety-one".