257525155 has 4 divisors (see below), whose sum is σ = 309030192. Its totient is φ = 206020120.

The previous prime is 257525123. The next prime is 257525159. The reversal of 257525155 is 551525752.

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

It is not a de Polignac number, because 257525155 - 2⁵ = 257525123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257525159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25752511 + ... + 25752520.

It is an arithmetic number, because the mean of its divisors is an integer number (77257548).

Almost surely, 2^257525155 is an apocalyptic number.

257525155 is a deficient number, since it is larger than the sum of its proper divisors (51505037).

257525155 is an equidigital number, since it uses as much as digits as its factorization.

257525155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51505036.

The product of its digits is 87500, while the sum is 37.

The square root of 257525155 is about 16047.5903175524. The cubic root of 257525155 is about 636.2188794456.

It can be divided in two parts, 2575 and 25155, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 257525155 in words is "two hundred fifty-seven million, five hundred twenty-five thousand, one hundred fifty-five".