18516999786 has 64 divisors (see below), whose sum is σ = 39867379200. Its totient is φ = 5722105536.

The previous prime is 18516999779. The next prime is 18516999797. The reversal of 18516999786 is 68799961581.

18516999786 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18516999786.

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, 420465 + ... + 462411.

It is an arithmetic number, because the mean of its divisors is an integer number (622927800).

Almost surely, 2^18516999786 is an apocalyptic number.

18516999786 is an abundant number, since it is smaller than the sum of its proper divisors (21350379414).

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

18516999786 is a wasteful number, since it uses less digits than its factorization.

18516999786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42083.

The product of its digits is 58786560, while the sum is 69.

It can be divided in two parts, 1851699 and 9786, that added together give a triangular number (1861485 = T₁₉₂₉).

The spelling of 18516999786 in words is "eighteen billion, five hundred sixteen million, nine hundred ninety-nine thousand, seven hundred eighty-six".