18638646600 has 384 divisors, whose sum is σ = 69809817600. Its totient is φ = 4029799680.

The previous prime is 18638646599. The next prime is 18638646629. The reversal of 18638646600 is 664683681.

It is a self number, because there is not a number n which added to its sum of digits gives 18638646600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28807477 + ... + 28808123.

It is an arithmetic number, because the mean of its divisors is an integer number (181796400).

Almost surely, 2^18638646600 is an apocalyptic number.

18638646600 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 18638646600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34904908800).

18638646600 is an abundant number, since it is smaller than the sum of its proper divisors (51171171000).

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

18638646600 is a wasteful number, since it uses less digits than its factorization.

18638646600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 18638646600 in words is "eighteen billion, six hundred thirty-eight million, six hundred forty-six thousand, six hundred".