257170465 has 4 divisors (see below), whose sum is σ = 308604564. Its totient is φ = 205736368.

The previous prime is 257170421. The next prime is 257170483. The reversal of 257170465 is 564071752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112954384 + 144216081 = 10628^2 + 12009^2 .

It is a cyclic number.

It is not a de Polignac number, because 257170465 - 2⁹ = 257169953 is a prime.

It is a super-2 number, since 2×257170465² = 132273296136632450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25717042 + ... + 25717051.

It is an arithmetic number, because the mean of its divisors is an integer number (77151141).

Almost surely, 2^257170465 is an apocalyptic number.

It is an amenable number.

257170465 is a deficient number, since it is larger than the sum of its proper divisors (51434099).

257170465 is an equidigital number, since it uses as much as digits as its factorization.

257170465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51434098.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 257170465 is about 16036.5353178297. The cubic root of 257170465 is about 635.9266566598.

The spelling of 257170465 in words is "two hundred fifty-seven million, one hundred seventy thousand, four hundred sixty-five".