257666073 has 16 divisors (see below), whose sum is σ = 406174080. Its totient is φ = 142160256.

The previous prime is 257666069. The next prime is 257666089. The reversal of 257666073 is 370666752.

It is not a de Polignac number, because 257666073 - 2² = 257666069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257666053) 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, 210940 + ... + 212157.

It is an arithmetic number, because the mean of its divisors is an integer number (25385880).

Almost surely, 2^257666073 is an apocalyptic number.

It is an amenable number.

257666073 is a deficient number, since it is larger than the sum of its proper divisors (148508007).

257666073 is a wasteful number, since it uses less digits than its factorization.

257666073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423136.

The product of its (nonzero) digits is 317520, while the sum is 42.

The square root of 257666073 is about 16051.9803451163. The cubic root of 257666073 is about 636.3349048024.

The spelling of 257666073 in words is "two hundred fifty-seven million, six hundred sixty-six thousand, seventy-three".