257156094487 has 2 divisors, whose sum is σ = 257156094488. Its totient is φ = 257156094486.

The previous prime is 257156094473. The next prime is 257156094509. The reversal of 257156094487 is 784490651752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257156094487 - 2³¹ = 255008610839 is a prime.

It is a super-2 number, since 2×257156094487² (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 (257156094787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128578047243 + 128578047244.

It is an arithmetic number, because the mean of its divisors is an integer number (128578047244).

Almost surely, 2^257156094487 is an apocalyptic number.

257156094487 is a deficient number, since it is larger than the sum of its proper divisors (1).

257156094487 is an equidigital number, since it uses as much as digits as its factorization.

257156094487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 257156094487 in words is "two hundred fifty-seven billion, one hundred fifty-six million, ninety-four thousand, four hundred eighty-seven".