257533065 has 12 divisors (see below), whose sum is σ = 446390724. Its totient is φ = 137350944.

The previous prime is 257533043. The next prime is 257533091. The reversal of 257533065 is 560335752.

257533065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 27373824 + 230159241 = 5232^2 + 15171^2 .

It is not a de Polignac number, because 257533065 - 2⁸ = 257532809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2861434 + ... + 2861523.

It is an arithmetic number, because the mean of its divisors is an integer number (37199227).

Almost surely, 2^257533065 is an apocalyptic number.

It is an amenable number.

257533065 is a deficient number, since it is larger than the sum of its proper divisors (188857659).

257533065 is a wasteful number, since it uses less digits than its factorization.

257533065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722968 (or 5722965 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 36.

The square root of 257533065 is about 16047.8367701071. The cubic root of 257533065 is about 636.2253932944.

The spelling of 257533065 in words is "two hundred fifty-seven million, five hundred thirty-three thousand, sixty-five".