257342155 has 32 divisors (see below), whose sum is σ = 365543424. Its totient is φ = 170263296.

The previous prime is 257342123. The next prime is 257342159. The reversal of 257342155 is 551243752.

It is not a de Polignac number, because 257342155 - 2⁵ = 257342123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257342155.

It is not an unprimeable number, because it can be changed into a prime (257342159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119014 + ... + 121156.

It is an arithmetic number, because the mean of its divisors is an integer number (11423232).

Almost surely, 2^257342155 is an apocalyptic number.

257342155 is a deficient number, since it is larger than the sum of its proper divisors (108201269).

257342155 is a wasteful number, since it uses less digits than its factorization.

257342155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275.

The product of its digits is 42000, while the sum is 34.

The square root of 257342155 is about 16041.8875136313. The cubic root of 257342155 is about 636.0681425280.

It can be divided in two parts, 25734 and 2155, that added together give a square (27889 = 167²).

The spelling of 257342155 in words is "two hundred fifty-seven million, three hundred forty-two thousand, one hundred fifty-five".