265135604165 has 16 divisors (see below), whose sum is σ = 320334534000. Its totient is φ = 210660936192.

The previous prime is 265135604117. The next prime is 265135604203. The reversal of 265135604165 is 561406531562.

265135604165 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 8 ways, for example, as 103556527204 + 161579076961 = 321802^2 + 401969^2 .

It is a cyclic number.

It is not a de Polignac number, because 265135604165 - 2¹⁰ = 265135603141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9561641 + ... + 9589329.

It is an arithmetic number, because the mean of its divisors is an integer number (20020908375).

Almost surely, 2^265135604165 is an apocalyptic number.

It is an amenable number.

265135604165 is a deficient number, since it is larger than the sum of its proper divisors (55198929835).

265135604165 is a wasteful number, since it uses less digits than its factorization.

265135604165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40696.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 265135604165 in words is "two hundred sixty-five billion, one hundred thirty-five million, six hundred four thousand, one hundred sixty-five".