18009091996 has 48 divisors (see below), whose sum is σ = 36478955520. Its totient is φ = 7619584320.

The previous prime is 18009091987. The next prime is 18009092009. The reversal of 18009091996 is 69919090081.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5201706 + ... + 5205166.

It is an arithmetic number, because the mean of its divisors is an integer number (759978240).

Almost surely, 2^18009091996 is an apocalyptic number.

It is an amenable number.

18009091996 is an abundant number, since it is smaller than the sum of its proper divisors (18469863524).

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

18009091996 is a wasteful number, since it uses less digits than its factorization.

18009091996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5794 (or 5792 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 52.

The spelling of 18009091996 in words is "eighteen billion, nine million, ninety-one thousand, nine hundred ninety-six".