11111110111111 has 4 divisors (see below), whose sum is σ = 11198599167232. Its totient is φ = 11023621054992.

The previous prime is 11111110111081. The next prime is 11111110111139. The reversal of 11111110111111 is 11111101111111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111110111111 - 2²¹ = 11111108013959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111110111091 and 11111110111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111110118111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43744527870 + ... + 43744528123.

It is an arithmetic number, because the mean of its divisors is an integer number (2799649791808).

Almost surely, 2^{11111110111111} is an apocalyptic number.

11111110111111 is a deficient number, since it is larger than the sum of its proper divisors (87489056121).

11111110111111 is an equidigital number, since it uses as much as digits as its factorization.

11111110111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87489056120.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 11111110111111 its reverse (11111101111111), we get a palindrome (22222211222222).

Subtracting from 11111110111111 its reverse (11111101111111), we obtain a square (9000000 = 3000²).

The spelling of 11111110111111 in words is "eleven trillion, one hundred eleven billion, one hundred ten million, one hundred eleven thousand, one hundred eleven".