265257161 has 12 divisors (see below), whose sum is σ = 287693568. Its totient is φ = 244458864.

The previous prime is 265257133. The next prime is 265257191. The reversal of 265257161 is 161752562.

It is a de Polignac number, because none of the positive numbers 2^k-265257161 is a prime.

It is a super-2 number, since 2×265257161² = 140722722923559842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (265257121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185696 + ... + 187118.

It is an arithmetic number, because the mean of its divisors is an integer number (23974464).

Almost surely, 2^265257161 is an apocalyptic number.

It is an amenable number.

265257161 is a deficient number, since it is larger than the sum of its proper divisors (22436407).

265257161 is a wasteful number, since it uses less digits than its factorization.

265257161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552 (or 2539 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 265257161 is about 16286.7173181093. The cubic root of 265257161 is about 642.5235334837.

The spelling of 265257161 in words is "two hundred sixty-five million, two hundred fifty-seven thousand, one hundred sixty-one".