18816079812 has 24 divisors (see below), whose sum is σ = 43962205056. Its totient is φ = 6263738208.

The previous prime is 18816079811. The next prime is 18816079819. The reversal of 18816079812 is 21897061881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18816079811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026588 + ... + 1044755.

It is an arithmetic number, because the mean of its divisors is an integer number (1831758544).

Almost surely, 2^18816079812 is an apocalyptic number.

18816079812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18816079812 is an abundant number, since it is smaller than the sum of its proper divisors (25146125244).

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

18816079812 is a wasteful number, since it uses less digits than its factorization.

18816079812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072107 (or 2072105 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 51.

The spelling of 18816079812 in words is "eighteen billion, eight hundred sixteen million, seventy-nine thousand, eight hundred twelve".