111666111 has 16 divisors (see below), whose sum is σ = 154412544. Its totient is φ = 71721504.

The previous prime is 111666091. The next prime is 111666119.

111666111 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 111666111 - 2¹⁰ = 111665087 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6550 + ... + 16316.

It is an arithmetic number, because the mean of its divisors is an integer number (9650784).

Almost surely, 2^111666111 is an apocalyptic number.

111666111 is a deficient number, since it is larger than the sum of its proper divisors (42746433).

111666111 is a wasteful number, since it uses less digits than its factorization.

111666111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910.

The product of its digits is 216, while the sum is 24.

The square root of 111666111 is about 10567.2186974625. The cubic root of 111666111 is about 481.5489760603.

The spelling of 111666111 in words is "one hundred eleven million, six hundred sixty-six thousand, one hundred eleven".