265861165 has 16 divisors (see below), whose sum is σ = 322541568. Its totient is φ = 210361536.

The previous prime is 265861157. The next prime is 265861171. The reversal of 265861165 is 561168562.

It is a cyclic number.

It is not a de Polignac number, because 265861165 - 2³ = 265861157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388914 + ... + 389596.

It is an arithmetic number, because the mean of its divisors is an integer number (20158848).

Almost surely, 2^265861165 is an apocalyptic number.

It is an amenable number.

265861165 is a deficient number, since it is larger than the sum of its proper divisors (56680403).

265861165 is a wasteful number, since it uses less digits than its factorization.

265861165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

The product of its digits is 86400, while the sum is 40.

The square root of 265861165 is about 16305.2496147713. The cubic root of 265861165 is about 643.0108500064.

The spelling of 265861165 in words is "two hundred sixty-five million, eight hundred sixty-one thousand, one hundred sixty-five".