2561612642 has 16 divisors (see below), whose sum is σ = 4120968960. Its totient is φ = 1190500272.

The previous prime is 2561612633. The next prime is 2561612671. The reversal of 2561612642 is 2462161652.

2561612642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633938 + ... + 637965.

It is an arithmetic number, because the mean of its divisors is an integer number (257560560).

Almost surely, 2^2561612642 is an apocalyptic number.

2561612642 is a deficient number, since it is larger than the sum of its proper divisors (1559356318).

2561612642 is a wasteful number, since it uses less digits than its factorization.

2561612642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271977.

The product of its digits is 34560, while the sum is 35.

The square root of 2561612642 is about 50612.3763717927. The cubic root of 2561612642 is about 1368.2679448620.

The spelling of 2561612642 in words is "two billion, five hundred sixty-one million, six hundred twelve thousand, six hundred forty-two".