111111099990 has 64 divisors (see below), whose sum is σ = 292179605760. Its totient is φ = 26818381440.

The previous prime is 111111099971. The next prime is 111111099991. The reversal of 111111099990 is 99990111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111099991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 659584 + ... + 810723.

It is an arithmetic number, because the mean of its divisors is an integer number (4565306340).

Almost surely, 2^111111099990 is an apocalyptic number.

111111099990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111111099990 is an abundant number, since it is smaller than the sum of its proper divisors (181068505770).

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

111111099990 is a wasteful number, since it uses less digits than its factorization.

111111099990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470557.

The product of its (nonzero) digits is 6561, while the sum is 42.

The spelling of 111111099990 in words is "one hundred eleven billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety".