111111099918 has 128 divisors (see below), whose sum is σ = 289764034560. Its totient is φ = 27563950080.

The previous prime is 111111099917. The next prime is 111111099919. The reversal of 111111099918 is 819990111111.

111111099918 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (111111099917) and next prime (111111099919).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 111111099918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111099917) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25903918 + ... + 25908206.

It is an arithmetic number, because the mean of its divisors is an integer number (2263781520).

Almost surely, 2^111111099918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111099918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144882017280).

111111099918 is an abundant number, since it is smaller than the sum of its proper divisors (178652934642).

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

111111099918 is a wasteful number, since it uses less digits than its factorization.

111111099918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122.

The product of its (nonzero) digits is 5832, while the sum is 42.

The spelling of 111111099918 in words is "one hundred eleven billion, one hundred eleven million, ninety-nine thousand, nine hundred eighteen".