999998888888888 has 128 divisors (see below), whose sum is σ = 2204487463127040. Its totient is φ = 416335406976000.

The previous prime is 999998888888851. The next prime is 999998888888897. The reversal of 999998888888888 is 888888888899999.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1082816495 + ... + 1083739617.

It is an arithmetic number, because the mean of its divisors is an integer number (17222558305680).

Almost surely, 2^{999998888888888} 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 999998888888888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102243731563520).

999998888888888 is an abundant number, since it is smaller than the sum of its proper divisors (1204488574238152).

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

999998888888888 is a wasteful number, since it uses less digits than its factorization.

999998888888888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925189 (or 925185 counting only the distinct ones).

The product of its digits is 63403380965376, while the sum is 125.

The spelling of 999998888888888 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-eight".