11665638864 has 60 divisors (see below), whose sum is σ = 35615553792. Its totient is φ = 3535041600.

The previous prime is 11665638839. The next prime is 11665638917. The reversal of 11665638864 is 46883656611.

11665638864 is a `hidden beast` number, since 1 + 16 + 6 + 563 + 8 + 8 + 64 = 666.

11665638864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 11665638864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3680752 + ... + 3683919.

Almost surely, 2^11665638864 is an apocalyptic number.

It is an amenable number.

11665638864 is an abundant number, since it is smaller than the sum of its proper divisors (23949914928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11665638864 is a wasteful number, since it uses less digits than its factorization.

11665638864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7364696 (or 7364687 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 11665638864 in words is "eleven billion, six hundred sixty-five million, six hundred thirty-eight thousand, eight hundred sixty-four".