2565753644 has 12 divisors (see below), whose sum is σ = 4491177600. Its totient is φ = 1282560048.

The previous prime is 2565753643. The next prime is 2565753647. The reversal of 2565753644 is 4463575652.

2565753644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2565753643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60479 + ... + 93750.

It is an arithmetic number, because the mean of its divisors is an integer number (374264800).

Almost surely, 2^2565753644 is an apocalyptic number.

It is an amenable number.

2565753644 is a deficient number, since it is larger than the sum of its proper divisors (1925423956).

2565753644 is a wasteful number, since it uses less digits than its factorization.

2565753644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158392 (or 158390 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 47.

The square root of 2565753644 is about 50653.2688382497. The cubic root of 2565753644 is about 1369.0048439281.

The spelling of 2565753644 in words is "two billion, five hundred sixty-five million, seven hundred fifty-three thousand, six hundred forty-four".