18275991800 has 96 divisors (see below), whose sum is σ = 46693685520. Its totient is φ = 6597196800.

The previous prime is 18275991743. The next prime is 18275991821. The reversal of 18275991800 is 819957281.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 271082 + ... + 331718.

Almost surely, 2^18275991800 is an apocalyptic number.

18275991800 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 18275991800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23346842760).

18275991800 is an abundant number, since it is smaller than the sum of its proper divisors (28417693720).

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

18275991800 is a wasteful number, since it uses less digits than its factorization.

18275991800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60801 (or 60792 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 50.

The spelling of 18275991800 in words is "eighteen billion, two hundred seventy-five million, nine hundred ninety-one thousand, eight hundred".