18539550000 has 480 divisors, whose sum is σ = 68815595520. Its totient is φ = 4773600000.

The previous prime is 18539549933. The next prime is 18539550053. The reversal of 18539550000 is 5593581.

It is a happy number.

18539550000 is a `hidden beast` number, since 18 + 53 + 95 + 500 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41849779 + ... + 41850221.

It is an arithmetic number, because the mean of its divisors is an integer number (143365824).

Almost surely, 2^18539550000 is an apocalyptic number.

18539550000 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 18539550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34407797760).

18539550000 is an abundant number, since it is smaller than the sum of its proper divisors (50276045520).

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

18539550000 is an equidigital number, since it uses as much as digits as its factorization.

18539550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 18539550000 in words is "eighteen billion, five hundred thirty-nine million, five hundred fifty thousand".