11616555665 has 32 divisors (see below), whose sum is σ = 16941657600. Its totient is φ = 7529598720.

The previous prime is 11616555653. The next prime is 11616555683. The reversal of 11616555665 is 56655561611.

It is not a de Polignac number, because 11616555665 - 2¹⁴ = 11616539281 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259385 + ... + 300854.

It is an arithmetic number, because the mean of its divisors is an integer number (529426800).

Almost surely, 2^11616555665 is an apocalyptic number.

It is an amenable number.

11616555665 is a deficient number, since it is larger than the sum of its proper divisors (5325101935).

11616555665 is a wasteful number, since it uses less digits than its factorization.

11616555665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560297.

The product of its digits is 810000, while the sum is 47.

The spelling of 11616555665 in words is "eleven billion, six hundred sixteen million, five hundred fifty-five thousand, six hundred sixty-five".