2265165644 has 24 divisors (see below), whose sum is σ = 4531339680. Its totient is φ = 970569216.

The previous prime is 2265165619. The next prime is 2265165659. The reversal of 2265165644 is 4465615622.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236354 + ... + 245750.

It is an arithmetic number, because the mean of its divisors is an integer number (188805820).

Almost surely, 2^2265165644 is an apocalyptic number.

It is an amenable number.

2265165644 is an abundant number, since it is smaller than the sum of its proper divisors (2266174036).

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

2265165644 is a wasteful number, since it uses less digits than its factorization.

2265165644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18017 (or 18015 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 2265165644 is about 47593.7563552195. The cubic root of 2265165644 is about 1313.3081982758.

The spelling of 2265165644 in words is "two billion, two hundred sixty-five million, one hundred sixty-five thousand, six hundred forty-four".