18918885888 has 360 divisors, whose sum is σ = 66295408608. Its totient is φ = 5168959488.

The previous prime is 18918885859. The next prime is 18918885893. The reversal of 18918885888 is 88858881981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5191395 + ... + 5195037.

Almost surely, 2^18918885888 is an apocalyptic number.

18918885888 is a gapful number since it is divisible by the number (18) 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 18918885888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33147704304).

18918885888 is an abundant number, since it is smaller than the sum of its proper divisors (47376522720).

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

18918885888 is a wasteful number, since it uses less digits than its factorization.

18918885888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704 (or 3678 counting only the distinct ones).

The product of its digits is 94371840, while the sum is 72.

The spelling of 18918885888 in words is "eighteen billion, nine hundred eighteen million, eight hundred eighty-five thousand, eight hundred eighty-eight".