257945666 has 32 divisors (see below), whose sum is σ = 428630400. Its totient is φ = 115447680.

The previous prime is 257945609. The next prime is 257945669. The reversal of 257945666 is 666549752.

It is not an unprimeable number, because it can be changed into a prime (257945669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630470 + ... + 630878.

It is an arithmetic number, because the mean of its divisors is an integer number (13394700).

Almost surely, 2^257945666 is an apocalyptic number.

257945666 is a deficient number, since it is larger than the sum of its proper divisors (170684734).

257945666 is a wasteful number, since it uses less digits than its factorization.

257945666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its digits is 2721600, while the sum is 50.

The square root of 257945666 is about 16060.6869716087. The cubic root of 257945666 is about 636.5649835629.

The spelling of 257945666 in words is "two hundred fifty-seven million, nine hundred forty-five thousand, six hundred sixty-six".