11111112198 has 32 divisors (see below), whose sum is σ = 25039134720. Its totient is φ = 3651537960.

The previous prime is 11111112191. The next prime is 11111112209. The reversal of 11111112198 is 89121111111.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111112191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1445190 + ... + 1452857.

It is an arithmetic number, because the mean of its divisors is an integer number (782472960).

Almost surely, 2^11111112198 is an apocalyptic number.

11111112198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11111112198 is an abundant number, since it is smaller than the sum of its proper divisors (13928022522).

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

11111112198 is a wasteful number, since it uses less digits than its factorization.

11111112198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898129 (or 2898123 counting only the distinct ones).

The product of its digits is 144, while the sum is 27.

The spelling of 11111112198 in words is "eleven billion, one hundred eleven million, one hundred twelve thousand, one hundred ninety-eight".