111999999988 has 24 divisors (see below), whose sum is σ = 196752088512. Its totient is φ = 55785347904.

The previous prime is 111999999983. The next prime is 111999999989. The reversal of 111999999988 is 889999999111.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111999999983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984131 + ... + 2039797.

It is an arithmetic number, because the mean of its divisors is an integer number (8198003688).

Almost surely, 2^111999999988 is an apocalyptic number.

It is an amenable number.

111999999988 is a deficient number, since it is larger than the sum of its proper divisors (84752088524).

111999999988 is a wasteful number, since it uses less digits than its factorization.

111999999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57591 (or 57589 counting only the distinct ones).

The product of its digits is 306110016, while the sum is 82.

The spelling of 111999999988 in words is "one hundred eleven billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".