18188799000 has 128 divisors (see below), whose sum is σ = 57036096000. Its totient is φ = 4825814400.

The previous prime is 18188798987. The next prime is 18188799007. The reversal of 18188799000 is 99788181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18188799007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 581767 + ... + 612233.

It is an arithmetic number, because the mean of its divisors is an integer number (445594500).

Almost surely, 2^18188799000 is an apocalyptic number.

18188799000 is a gapful number since it is divisible by the number (10) 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 18188799000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28518048000).

18188799000 is an abundant number, since it is smaller than the sum of its proper divisors (38847297000).

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

18188799000 is a wasteful number, since it uses less digits than its factorization.

18188799000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30690 (or 30676 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 51.

The spelling of 18188799000 in words is "eighteen billion, one hundred eighty-eight million, seven hundred ninety-nine thousand".