257745851 has 12 divisors (see below), whose sum is σ = 287544936. Its totient is φ = 230809920.

The previous prime is 257745809. The next prime is 257745871. The reversal of 257745851 is 158547752.

It is a de Polignac number, because none of the positive numbers 2^k-257745851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257745871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7790 + ... + 24003.

It is an arithmetic number, because the mean of its divisors is an integer number (23962078).

Almost surely, 2^257745851 is an apocalyptic number.

257745851 is a deficient number, since it is larger than the sum of its proper divisors (29799085).

257745851 is a wasteful number, since it uses less digits than its factorization.

257745851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31882 (or 31871 counting only the distinct ones).

The product of its digits is 392000, while the sum is 44.

The square root of 257745851 is about 16054.4651421341. The cubic root of 257745851 is about 636.4005715612.

The spelling of 257745851 in words is "two hundred fifty-seven million, seven hundred forty-five thousand, eight hundred fifty-one".