18999163008 has 896 divisors, whose sum is σ = 72242928000. Its totient is φ = 4849238016.

The previous prime is 18999162977. The next prime is 18999163021. The reversal of 18999163008 is 80036199981.

It is a tau number, because it is divible by the number of its divisors (896).

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

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 322019683 + ... + 322019741.

Almost surely, 2^18999163008 is an apocalyptic number.

18999163008 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 18999163008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36121464000).

18999163008 is an abundant number, since it is smaller than the sum of its proper divisors (53243764992).

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

18999163008 is an equidigital number, since it uses as much as digits as its factorization.

18999163008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The spelling of 18999163008 in words is "eighteen billion, nine hundred ninety-nine million, one hundred sixty-three thousand, eight".