116821811868 has 12 divisors (see below), whose sum is σ = 272584227720. Its totient is φ = 38940603952.

The previous prime is 116821811867. The next prime is 116821811891. The reversal of 116821811868 is 868118128611.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 116821811868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116821811863) 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, 4867575483 + ... + 4867575506.

It is an arithmetic number, because the mean of its divisors is an integer number (22715352310).

Almost surely, 2^116821811868 is an apocalyptic number.

It is an amenable number.

116821811868 is an abundant number, since it is smaller than the sum of its proper divisors (155762415852).

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

116821811868 is a wasteful number, since it uses less digits than its factorization.

116821811868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9735150996 (or 9735150994 counting only the distinct ones).

The product of its digits is 294912, while the sum is 51.

The spelling of 116821811868 in words is "one hundred sixteen billion, eight hundred twenty-one million, eight hundred eleven thousand, eight hundred sixty-eight".