2661216056 has 16 divisors (see below), whose sum is σ = 5045846400. Its totient is φ = 1315657024.

The previous prime is 2661216053. The next prime is 2661216071. The reversal of 2661216056 is 6506121662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661216053) 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, 1868120 + ... + 1869543.

It is an arithmetic number, because the mean of its divisors is an integer number (315365400).

Almost surely, 2^2661216056 is an apocalyptic number.

It is an amenable number.

2661216056 is a deficient number, since it is larger than the sum of its proper divisors (2384630344).

2661216056 is a wasteful number, since it uses less digits than its factorization.

2661216056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737758 (or 3737754 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 2661216056 is about 51586.9756430826. The cubic root of 2661216056 is about 1385.7770936555. Note that the first 3 decimals are identical.

The spelling of 2661216056 in words is "two billion, six hundred sixty-one million, two hundred sixteen thousand, fifty-six".