11965116818 has 6 divisors (see below), whose sum is σ = 17947907271. Its totient is φ = 5982481062.

The previous prime is 11965116781. The next prime is 11965116853. The reversal of 11965116818 is 81861156911.

11965116818 is digitally balanced in base 5, 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., 5982558409 + 5982558409 = 77347^2 + 77347^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=77347.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 116021 + ... + 193367.

Almost surely, 2^11965116818 is an apocalyptic number.

11965116818 is a deficient number, since it is larger than the sum of its proper divisors (5982790453).

11965116818 is an frugal number, since it uses more digits than its factorization.

11965116818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154696 (or 77349 counting only the distinct ones).

The product of its digits is 103680, while the sum is 47.

The spelling of 11965116818 in words is "eleven billion, nine hundred sixty-five million, one hundred sixteen thousand, eight hundred eighteen".