18995215800 has 192 divisors, whose sum is σ = 67619779200. Its totient is φ = 4362508800.

The previous prime is 18995215787. The next prime is 18995215801. The reversal of 18995215800 is 851259981.

It is a self number, because there is not a number n which added to its sum of digits gives 18995215800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995215801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49662 + ... + 201138.

It is an arithmetic number, because the mean of its divisors is an integer number (352186350).

Almost surely, 2^18995215800 is an apocalyptic number.

18995215800 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 18995215800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33809889600).

18995215800 is an abundant number, since it is smaller than the sum of its proper divisors (48624563400).

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

18995215800 is a wasteful number, since it uses less digits than its factorization.

18995215800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151526 (or 151517 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 48.

The spelling of 18995215800 in words is "eighteen billion, nine hundred ninety-five million, two hundred fifteen thousand, eight hundred".