257166413 has 4 divisors (see below), whose sum is σ = 293904480. Its totient is φ = 220428348.

The previous prime is 257166407. The next prime is 257166431. The reversal of 257166413 is 314661752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 257166413 - 2¹⁸ = 256904269 is a prime.

It is a super-2 number, since 2×257166413² = 132269127950573138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257166433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18369023 + ... + 18369036.

It is an arithmetic number, because the mean of its divisors is an integer number (73476120).

Almost surely, 2^257166413 is an apocalyptic number.

It is an amenable number.

257166413 is a deficient number, since it is larger than the sum of its proper divisors (36738067).

257166413 is an equidigital number, since it uses as much as digits as its factorization.

257166413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36738066.

The product of its digits is 30240, while the sum is 35.

The square root of 257166413 is about 16036.4089808161. The cubic root of 257166413 is about 635.9233167372.

The spelling of 257166413 in words is "two hundred fifty-seven million, one hundred sixty-six thousand, four hundred thirteen".