999999999888888 has 64 divisors (see below), whose sum is σ = 2568834255461760. Its totient is φ = 324164321571456.

The previous prime is 999999999888847. The next prime is 999999999888907. The reversal of 999999999888888 is 888888999999999.

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 15 ways as a sum of consecutive naturals, for example, 275981506 + ... + 279581457.

It is an arithmetic number, because the mean of its divisors is an integer number (40138035241590).

Almost surely, 2^{999999999888888} is an apocalyptic number.

It is an amenable number.

999999999888888 is an abundant number, since it is smaller than the sum of its proper divisors (1568834255572872).

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

999999999888888 is a wasteful number, since it uses less digits than its factorization.

999999999888888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555565036 (or 555565032 counting only the distinct ones).

The product of its digits is 101559956668416, while the sum is 129.

The spelling of 999999999888888 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, eight hundred eighty-eight thousand, eight hundred eighty-eight".