18061781922 has 30 divisors (see below), whose sum is σ = 40475603883. Its totient is φ = 6020023788.

The previous prime is 18061781893. The next prime is 18061781939. The reversal of 18061781922 is 22918716081.

18061781922 is a `hidden beast` number, since 1 + 8 + 0 + 617 + 8 + 1 + 9 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9030890961 + 9030890961 = 95031^2 + 95031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95031.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1705279 + ... + 1715837.

Almost surely, 2^18061781922 is an apocalyptic number.

18061781922 is an abundant number, since it is smaller than the sum of its proper divisors (22413821961).

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

18061781922 is an frugal number, since it uses more digits than its factorization.

18061781922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21132 (or 10564 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 18061781922 in words is "eighteen billion, sixty-one million, seven hundred eighty-one thousand, nine hundred twenty-two".