2505865664 has 28 divisors (see below), whose sum is σ = 4975229064. Its totient is φ = 1252264704.

The previous prime is 2505865619. The next prime is 2505865741. The reversal of 2505865664 is 4665685052.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 123914 + ... + 142710.

Almost surely, 2^2505865664 is an apocalyptic number.

It is an amenable number.

2505865664 is a deficient number, since it is larger than the sum of its proper divisors (2469363400).

2505865664 is a wasteful number, since it uses less digits than its factorization.

2505865664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892 (or 20882 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The square root of 2505865664 is about 50058.6222742896. The cubic root of 2505865664 is about 1358.2694366705.

The spelling of 2505865664 in words is "two billion, five hundred five million, eight hundred sixty-five thousand, six hundred sixty-four".