257646522497 has 16 divisors (see below), whose sum is σ = 317362832640. Its totient is φ = 203685423552.

The previous prime is 257646522479. The next prime is 257646522503. The reversal of 257646522497 is 794225646752.

It is not a de Polignac number, because 257646522497 - 2²⁴ = 257629745281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257646522437) 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 in 15 ways as a sum of consecutive naturals, for example, 1046222 + ... + 1268807.

It is an arithmetic number, because the mean of its divisors is an integer number (19835177040).

Almost surely, 2^257646522497 is an apocalyptic number.

It is an amenable number.

257646522497 is a deficient number, since it is larger than the sum of its proper divisors (59716310143).

257646522497 is a wasteful number, since it uses less digits than its factorization.

257646522497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316272.

The product of its digits is 50803200, while the sum is 59.

The spelling of 257646522497 in words is "two hundred fifty-seven billion, six hundred forty-six million, five hundred twenty-two thousand, four hundred ninety-seven".