2165603265 has 36 divisors (see below), whose sum is σ = 4366567764. Its totient is φ = 989989056.

The previous prime is 2165603263. The next prime is 2165603309. The reversal of 2165603265 is 5623065612.

It is a happy number.

2165603265 is a `hidden beast` number, since 2 + 1 + 6 + 560 + 32 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 782432784 + 1383170481 = 27972^2 + 37191^2 .

It is not a de Polignac number, because 2165603265 - 2¹ = 2165603263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165603263) 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 35 ways as a sum of consecutive naturals, for example, 488862 + ... + 493271.

It is an arithmetic number, because the mean of its divisors is an integer number (121293549).

Almost surely, 2^2165603265 is an apocalyptic number.

It is an amenable number.

2165603265 is an abundant number, since it is smaller than the sum of its proper divisors (2200964499).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165603265 is a wasteful number, since it uses less digits than its factorization.

2165603265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982158 (or 982148 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 2165603265 is about 46536.0426443848. The cubic root of 2165603265 is about 1293.7776144774. Note that the first 3 decimals are identical.

Adding to 2165603265 its reverse (5623065612), we get a palindrome (7788668877).

The spelling of 2165603265 in words is "two billion, one hundred sixty-five million, six hundred three thousand, two hundred sixty-five".