165265 has 4 divisors (see below), whose sum is σ = 198324. Its totient is φ = 132208.

The previous prime is 165247. The next prime is 165287. The reversal of 165265 is 562561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562561 = 41 ⋅13721.

It can be written as a sum of positive squares in 2 ways, for example, as 101761 + 63504 = 319^2 + 252^2 .

It is a cyclic number.

It is not a de Polignac number, because 165265 - 2⁵ = 165233 is a prime.

It is a Duffinian number.

165265 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16522 + ... + 16531.

It is an arithmetic number, because the mean of its divisors is an integer number (49581).

2¹⁶⁵²⁶⁵ is an apocalyptic number.

It is an amenable number.

165265 is a deficient number, since it is larger than the sum of its proper divisors (33059).

165265 is an equidigital number, since it uses as much as digits as its factorization.

165265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33058.

The product of its digits is 1800, while the sum is 25.

The square root of 165265 is about 406.5279818168. The cubic root of 165265 is about 54.8774129245.

The spelling of 165265 in words is "one hundred sixty-five thousand, two hundred sixty-five".