18923026987808 has 144 divisors (see below), whose sum is σ = 39947081973120. Its totient is φ = 8799247378944.

The previous prime is 18923026987801. The next prime is 18923026987829. The reversal of 18923026987808 is 80878962032981.

It is not an unprimeable number, because it can be changed into a prime (18923026987801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 799676585 + ... + 799700247.

It is an arithmetic number, because the mean of its divisors is an integer number (277410291480).

Almost surely, 2^{18923026987808} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18923026987808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19973540986560).

18923026987808 is an abundant number, since it is smaller than the sum of its proper divisors (21024054985312).

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

18923026987808 is a wasteful number, since it uses less digits than its factorization.

18923026987808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24119 (or 24044 counting only the distinct ones).

The product of its (nonzero) digits is 167215104, while the sum is 71.

The spelling of 18923026987808 in words is "eighteen trillion, nine hundred twenty-three billion, twenty-six million, nine hundred eighty-seven thousand, eight hundred eight".