111111011009999 has 32 divisors (see below), whose sum is σ = 149660641449984. Its totient is φ = 79664672206080.

The previous prime is 111111011009951. The next prime is 111111011010089. The reversal of 111111011009999 is 999900110111111.

It is not a de Polignac number, because 111111011009999 - 2³⁶ = 111042291533263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111011009399) 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, 177002999 + ... + 177629624.

It is an arithmetic number, because the mean of its divisors is an integer number (4676895045312).

Almost surely, 2^{111111011009999} is an apocalyptic number.

111111011009999 is a deficient number, since it is larger than the sum of its proper divisors (38549630439985).

111111011009999 is a wasteful number, since it uses less digits than its factorization.

111111011009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354632967.

The product of its (nonzero) digits is 6561, while the sum is 44.

The spelling of 111111011009999 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, nine thousand, nine hundred ninety-nine".