2661536656 has 20 divisors (see below), whose sum is σ = 5173212172. Its totient is φ = 1326514176.

The previous prime is 2661536639. The next prime is 2661536671. The reversal of 2661536656 is 6566351662.

2661536656 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 2 ways, for example, as 1422496656 + 1239040000 = 37716^2 + 35200^2 .

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, 260721 + ... + 270736.

Almost surely, 2^2661536656 is an apocalyptic number.

It is an amenable number.

2661536656 is a deficient number, since it is larger than the sum of its proper divisors (2511675516).

2661536656 is a wasteful number, since it uses less digits than its factorization.

2661536656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531778 (or 531772 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 46.

The square root of 2661536656 is about 51590.0829229805. The cubic root of 2661536656 is about 1385.8327401829.

The spelling of 2661536656 in words is "two billion, six hundred sixty-one million, five hundred thirty-six thousand, six hundred fifty-six".