18091809792 has 198 divisors, whose sum is σ = 60770156928. Its totient is φ = 5168959488.

The previous prime is 18091809767. The next prime is 18091809793. The reversal of 18091809792 is 29790819081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18091809793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 431553 + ... + 471615.

Almost surely, 2^18091809792 is an apocalyptic number.

18091809792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18091809792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30385078464).

18091809792 is an abundant number, since it is smaller than the sum of its proper divisors (42678347136).

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

18091809792 is a wasteful number, since it uses less digits than its factorization.

18091809792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40103 (or 40075 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The spelling of 18091809792 in words is "eighteen billion, ninety-one million, eight hundred nine thousand, seven hundred ninety-two".