257166285 has 8 divisors (see below), whose sum is σ = 411466080. Its totient is φ = 137155344.

The previous prime is 257166277. The next prime is 257166323. The reversal of 257166285 is 582661752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257166285 - 2³ = 257166277 is a prime.

It is a super-2 number, since 2×257166285² = 132268996281402450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8572195 + ... + 8572224.

It is an arithmetic number, because the mean of its divisors is an integer number (51433260).

Almost surely, 2^257166285 is an apocalyptic number.

It is an amenable number.

257166285 is a deficient number, since it is larger than the sum of its proper divisors (154299795).

257166285 is a wasteful number, since it uses less digits than its factorization.

257166285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17144427.

The product of its digits is 201600, while the sum is 42.

The square root of 257166285 is about 16036.4049898972. The cubic root of 257166285 is about 635.9232112307.

The spelling of 257166285 in words is "two hundred fifty-seven million, one hundred sixty-six thousand, two hundred eighty-five".