257564663 has 4 divisors (see below), whose sum is σ = 257777520. Its totient is φ = 257351808.

The previous prime is 257564651. The next prime is 257564693. The reversal of 257564663 is 366465752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257564663 - 2²⁶ = 190455799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257564693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104603 + ... + 107036.

It is an arithmetic number, because the mean of its divisors is an integer number (64444380).

Almost surely, 2^257564663 is an apocalyptic number.

257564663 is a deficient number, since it is larger than the sum of its proper divisors (212857).

257564663 is a wasteful number, since it uses less digits than its factorization.

257564663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212856.

The product of its digits is 907200, while the sum is 44.

The square root of 257564663 is about 16048.8212339723. The cubic root of 257564663 is about 636.2514127725.

The spelling of 257564663 in words is "two hundred fifty-seven million, five hundred sixty-four thousand, six hundred sixty-three".