18808319808 has 168 divisors, whose sum is σ = 55926304200. Its totient is φ = 6036258816.

The previous prime is 18808319753. The next prime is 18808319809. The reversal of 18808319808 is 80891380881.

It can be written as a sum of positive squares in 4 ways, for example, as 11679557184 + 7128762624 = 108072^2 + 84432^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18808319809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6830560 + ... + 6833312.

Almost surely, 2^18808319808 is an apocalyptic number.

18808319808 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 18808319808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27963152100).

18808319808 is an abundant number, since it is smaller than the sum of its proper divisors (37117984392).

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

18808319808 is a wasteful number, since it uses less digits than its factorization.

18808319808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209 (or 3196 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 54.

The spelling of 18808319808 in words is "eighteen billion, eight hundred eight million, three hundred nineteen thousand, eight hundred eight".