2639561564 has 12 divisors (see below), whose sum is σ = 4620901488. Its totient is φ = 1319304000.

The previous prime is 2639561563. The next prime is 2639561569. The reversal of 2639561564 is 4651659362.

It is a super-2 number, since 2×2639561564² = 13934570500292252192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639561563) 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, 106592 + ... + 128999.

It is an arithmetic number, because the mean of its divisors is an integer number (385075124).

Almost surely, 2^2639561564 is an apocalyptic number.

It is an amenable number.

2639561564 is a deficient number, since it is larger than the sum of its proper divisors (1981339924).

2639561564 is a wasteful number, since it uses less digits than its factorization.

2639561564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238396 (or 238394 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 47.

The square root of 2639561564 is about 51376.6636129673. The cubic root of 2639561564 is about 1382.0081322129.

The spelling of 2639561564 in words is "two billion, six hundred thirty-nine million, five hundred sixty-one thousand, five hundred sixty-four".