165705025 has 6 divisors (see below), whose sum is σ = 205474262. Its totient is φ = 132564000.

The previous prime is 165705011. The next prime is 165705031. The reversal of 165705025 is 520507561.

It can be written as a sum of positive squares in 3 ways, for example, as 16641 + 165688384 = 129^2 + 12872^2 .

It is not a de Polignac number, because 165705025 - 2⁵ = 165704993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3314076 + ... + 3314125.

Almost surely, 2^165705025 is an apocalyptic number.

It is an amenable number.

165705025 is a deficient number, since it is larger than the sum of its proper divisors (39769237).

165705025 is an equidigital number, since it uses as much as digits as its factorization.

165705025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628211 (or 6628206 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 165705025 is about 12872.6463868157. The cubic root of 165705025 is about 549.2607423426.

The spelling of 165705025 in words is "one hundred sixty-five million, seven hundred five thousand, twenty-five".