257949065 has 16 divisors (see below), whose sum is σ = 340346880. Its totient is φ = 186117120.

The previous prime is 257949059. The next prime is 257949067. The reversal of 257949065 is 560949752.

It is not a de Polignac number, because 257949065 - 2¹⁸ = 257686921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257949067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11480 + ... + 25449.

It is an arithmetic number, because the mean of its divisors is an integer number (21271680).

Almost surely, 2^257949065 is an apocalyptic number.

It is an amenable number.

257949065 is a deficient number, since it is larger than the sum of its proper divisors (82397815).

257949065 is a wasteful number, since it uses less digits than its factorization.

257949065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37072.

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 257949065 is about 16060.7927886515. The cubic root of 257949065 is about 636.5677795973.

The spelling of 257949065 in words is "two hundred fifty-seven million, nine hundred forty-nine thousand, sixty-five".