11111111101111 has 8 divisors (see below), whose sum is σ = 12703745932704. Its totient is φ = 9519809580960.

The previous prime is 11111111101099. The next prime is 11111111101127. The reversal of 11111111101111 is 11110111111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11111111101111 - 2³³ = 11102521166519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111111101091 and 11111111101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111101151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333310000 + ... + 333343333.

It is an arithmetic number, because the mean of its divisors is an integer number (1587968241588).

Almost surely, 2^{11111111101111} is an apocalyptic number.

11111111101111 is a deficient number, since it is larger than the sum of its proper divisors (1592634831593).

11111111101111 is an equidigital number, since it uses as much as digits as its factorization.

11111111101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666655721.

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

Adding to 11111111101111 its reverse (11110111111111), we get a palindrome (22221222212222).

It can be divided in two parts, 11111 and 111101111, that multiplied together give a palindrome (1234444444321).

The spelling of 11111111101111 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred one thousand, one hundred eleven".