18615996000 has 576 divisors, whose sum is σ = 77974880256. Its totient is φ = 4116096000.

The previous prime is 18615995989. The next prime is 18615996023. The reversal of 18615996000 is 69951681.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 7810809 + ... + 7813191.

It is an arithmetic number, because the mean of its divisors is an integer number (135373056).

Almost surely, 2^18615996000 is an apocalyptic number.

18615996000 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 18615996000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38987440128).

18615996000 is an abundant number, since it is smaller than the sum of its proper divisors (59358884256).

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

18615996000 is a wasteful number, since it uses less digits than its factorization.

18615996000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2431 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 18615996000 in words is "eighteen billion, six hundred fifteen million, nine hundred ninety-six thousand".