2561669648 has 10 divisors (see below), whose sum is σ = 4963234974. Its totient is φ = 1280834816.

The previous prime is 2561669639. The next prime is 2561669711. The reversal of 2561669648 is 8469661652.

2561669648 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., 1956115984 + 605553664 = 44228^2 + 24608^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2561669648.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80052161 + ... + 80052192.

Almost surely, 2^2561669648 is an apocalyptic number.

It is an amenable number.

2561669648 is a deficient number, since it is larger than the sum of its proper divisors (2401565326).

2561669648 is a wasteful number, since it uses less digits than its factorization.

2561669648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160104361 (or 160104355 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 53.

The square root of 2561669648 is about 50612.9395313096. The cubic root of 2561669648 is about 1368.2780945756.

The spelling of 2561669648 in words is "two billion, five hundred sixty-one million, six hundred sixty-nine thousand, six hundred forty-eight".