2561945056 has 24 divisors (see below), whose sum is σ = 5502360024. Its totient is φ = 1164520320.

The previous prime is 2561945021. The next prime is 2561945143. The reversal of 2561945056 is 6505491652.

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, 3638775 + ... + 3639478.

It is an arithmetic number, because the mean of its divisors is an integer number (229265001).

Almost surely, 2^2561945056 is an apocalyptic number.

It is an amenable number.

2561945056 is an abundant number, since it is smaller than the sum of its proper divisors (2940414968).

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

2561945056 is a wasteful number, since it uses less digits than its factorization.

2561945056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278274 (or 7278266 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 43.

The square root of 2561945056 is about 50615.6601853616. The cubic root of 2561945056 is about 1368.3271278601.

The spelling of 2561945056 in words is "two billion, five hundred sixty-one million, nine hundred forty-five thousand, fifty-six".