257156094509 has 2 divisors, whose sum is σ = 257156094510. Its totient is φ = 257156094508.

The previous prime is 257156094487. The next prime is 257156094511. The reversal of 257156094509 is 905490651752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255552492484 + 1603602025 = 505522^2 + 40045^2 .

It is a cyclic number.

It is not a de Polignac number, because 257156094509 - 2⁸ = 257156094253 is a prime.

It is a super-2 number, since 2×257156094509² (a number of 24 digits) contains 22 as substring.

Together with 257156094511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257156090509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128578047254 + 128578047255.

It is an arithmetic number, because the mean of its divisors is an integer number (128578047255).

Almost surely, 2^257156094509 is an apocalyptic number.

It is an amenable number.

257156094509 is a deficient number, since it is larger than the sum of its proper divisors (1).

257156094509 is an equidigital number, since it uses as much as digits as its factorization.

257156094509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402000, while the sum is 53.

The spelling of 257156094509 in words is "two hundred fifty-seven billion, one hundred fifty-six million, ninety-four thousand, five hundred nine".