2565661544 has 8 divisors (see below), whose sum is σ = 4810615410. Its totient is φ = 1282830768.

The previous prime is 2565661537. The next prime is 2565661589. The reversal of 2565661544 is 4451665652.

2565661544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2034912100 + 530749444 = 45110^2 + 23038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2565661495 and 2565661504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160353839 + ... + 160353854.

Almost surely, 2^2565661544 is an apocalyptic number.

It is an amenable number.

2565661544 is a deficient number, since it is larger than the sum of its proper divisors (2244953866).

2565661544 is a wasteful number, since it uses less digits than its factorization.

2565661544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320707699 (or 320707695 counting only the distinct ones).

The product of its digits is 864000, while the sum is 44.

The square root of 2565661544 is about 50652.3597081123. The cubic root of 2565661544 is about 1368.9884631849.

The spelling of 2565661544 in words is "two billion, five hundred sixty-five million, six hundred sixty-one thousand, five hundred forty-four".