257648952657 has 8 divisors (see below), whose sum is σ = 343534356576. Its totient is φ = 171764758592.

The previous prime is 257648952637. The next prime is 257648952679. The reversal of 257648952657 is 756259846752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257648952657 - 2²⁰ = 257647904081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257648952637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494233 + ... + 871529.

It is an arithmetic number, because the mean of its divisors is an integer number (42941794572).

Almost surely, 2^257648952657 is an apocalyptic number.

It is an amenable number.

257648952657 is a deficient number, since it is larger than the sum of its proper divisors (85885403919).

257648952657 is a wasteful number, since it uses less digits than its factorization.

257648952657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604927.

The product of its digits is 254016000, while the sum is 66.

The spelling of 257648952657 in words is "two hundred fifty-seven billion, six hundred forty-eight million, nine hundred fifty-two thousand, six hundred fifty-seven".