165365265 has 32 divisors (see below), whose sum is σ = 299940480. Its totient is φ = 77124096.

The previous prime is 165365203. The next prime is 165365267. The reversal of 165365265 is 562563561.

It is not a de Polignac number, because 165365265 - 2⁶ = 165365201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (165365267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18612 + ... + 26021.

It is an arithmetic number, because the mean of its divisors is an integer number (9373140).

Almost surely, 2^165365265 is an apocalyptic number.

165365265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165365265 is a deficient number, since it is larger than the sum of its proper divisors (134575215).

165365265 is a wasteful number, since it uses less digits than its factorization.

165365265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44673.

The product of its digits is 162000, while the sum is 39.

The square root of 165365265 is about 12859.4426395548. The cubic root of 165365265 is about 548.8850858186.

The spelling of 165365265 in words is "one hundred sixty-five million, three hundred sixty-five thousand, two hundred sixty-five".