18199873920 has 128 divisors (see below), whose sum is σ = 59246691840. Its totient is φ = 4750014464.

The previous prime is 18199873897. The next prime is 18199873921. The reversal of 18199873920 is 2937899181.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199873921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10602 + ... + 191081.

It is an arithmetic number, because the mean of its divisors is an integer number (462864780).

Almost surely, 2^18199873920 is an apocalyptic number.

18199873920 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 18199873920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29623345920).

18199873920 is an abundant number, since it is smaller than the sum of its proper divisors (41046817920).

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

18199873920 is a wasteful number, since it uses less digits than its factorization.

18199873920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201752 (or 201740 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 57.

The spelling of 18199873920 in words is "eighteen billion, one hundred ninety-nine million, eight hundred seventy-three thousand, nine hundred twenty".