2565005644 has 6 divisors (see below), whose sum is σ = 4488759884. Its totient is φ = 1282502820.

The previous prime is 2565005623. The next prime is 2565005669. The reversal of 2565005644 is 4465005652.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320625702 + ... + 320625709.

Almost surely, 2^2565005644 is an apocalyptic number.

It is an amenable number.

2565005644 is a deficient number, since it is larger than the sum of its proper divisors (1923754240).

2565005644 is a wasteful number, since it uses less digits than its factorization.

2565005644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641251415 (or 641251413 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 2565005644 is about 50645.8847686562. The cubic root of 2565005644 is about 1368.8717946318.

It can be divided in two parts, 256500 and 5644, that added together give a 18-th power (262144 = 2¹⁸).

The spelling of 2565005644 in words is "two billion, five hundred sixty-five million, five thousand, six hundred forty-four".