257566216 has 32 divisors (see below), whose sum is σ = 495475200. Its totient is φ = 125455680.

The previous prime is 257566207. The next prime is 257566219. The reversal of 257566216 is 612665752.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (257566219) 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, 174361 + ... + 175831.

It is an arithmetic number, because the mean of its divisors is an integer number (15483600).

Almost surely, 2^257566216 is an apocalyptic number.

It is an amenable number.

257566216 is a deficient number, since it is larger than the sum of its proper divisors (237908984).

257566216 is a wasteful number, since it uses less digits than its factorization.

257566216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2025 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 257566216 is about 16048.8696175151. The cubic root of 257566216 is about 636.2526915407.

The spelling of 257566216 in words is "two hundred fifty-seven million, five hundred sixty-six thousand, two hundred sixteen".