111111011100999 has 144 divisors (see below), whose sum is σ = 203054431419840. Its totient is φ = 57012549580800.

The previous prime is 111111011100949. The next prime is 111111011101033. The reversal of 111111011100999 is 999001110111111.

It is not a de Polignac number, because 111111011100999 - 2⁹ = 111111011100487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111011100949) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 11101105107 + ... + 11101115115.

Almost surely, 2^{111111011100999} is an apocalyptic number.

111111011100999 is a deficient number, since it is larger than the sum of its proper divisors (91943420318841).

111111011100999 is a wasteful number, since it uses less digits than its factorization.

111111011100999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010 (or 19970 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 36.

The spelling of 111111011100999 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, one hundred thousand, nine hundred ninety-nine".