18489918600 has 336 divisors, whose sum is σ = 66691908900. Its totient is φ = 4759534080.

The previous prime is 18489918593. The next prime is 18489918631. The reversal of 18489918600 is 681998481.

18489918600 is a `hidden beast` number, since 18 + 4 + 8 + 9 + 9 + 18 + 600 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 7549176996 + 10940741604 = 86886^2 + 104598^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

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 83 ways as a sum of consecutive naturals, for example, 4226014 + ... + 4230386.

Almost surely, 2^18489918600 is an apocalyptic number.

18489918600 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 18489918600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33345954450).

18489918600 is an abundant number, since it is smaller than the sum of its proper divisors (48201990300).

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

18489918600 is a wasteful number, since it uses less digits than its factorization.

18489918600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 18489918600 in words is "eighteen billion, four hundred eighty-nine million, nine hundred eighteen thousand, six hundred".