111111110111111 has 16 divisors (see below), whose sum is σ = 121598368538400. Its totient is φ = 100688732928000.

The previous prime is 111111110111093. The next prime is 111111110111159. The reversal of 111111110111111 is 111111011111111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111110111111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111110111191) 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, 8274506 + ... + 17049623.

It is an arithmetic number, because the mean of its divisors is an integer number (7599898033650).

Almost surely, 2^{111111110111111} is an apocalyptic number.

111111110111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111111110111111 is a deficient number, since it is larger than the sum of its proper divisors (10487258427289).

111111110111111 is a wasteful number, since it uses less digits than its factorization.

111111110111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25325410.

The product of its (nonzero) digits is 1, while the sum is 14.

Adding to 111111110111111 its reverse (111111011111111), we get a palindrome (222222121222222).

It can be divided in two parts, 11 and 1111110111111, that multiplied together give a palindrome (12222211222221).

The spelling of 111111110111111 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred ten million, one hundred eleven thousand, one hundred eleven".