2165264636 has 12 divisors (see below), whose sum is σ = 4012108128. Its totient is φ = 1018948032.

The previous prime is 2165264623. The next prime is 2165264641. The reversal of 2165264636 is 6364625612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2165264593 and 2165264602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15920996 + ... + 15921131.

It is an arithmetic number, because the mean of its divisors is an integer number (334342344).

Almost surely, 2^2165264636 is an apocalyptic number.

It is an amenable number.

2165264636 is a deficient number, since it is larger than the sum of its proper divisors (1846843492).

2165264636 is a wasteful number, since it uses less digits than its factorization.

2165264636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31842148 (or 31842146 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 2165264636 is about 46532.4041502263. The cubic root of 2165264636 is about 1293.7101762314.

The spelling of 2165264636 in words is "two billion, one hundred sixty-five million, two hundred sixty-four thousand, six hundred thirty-six".