111161111611 has 4 divisors (see below), whose sum is σ = 121266667224. Its totient is φ = 101055556000.

The previous prime is 111161111587. The next prime is 111161111651. The reversal of 111161111611 is 116111161111.

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 111161111611 - 2⁹ = 111161111099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111161111651) 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 3 ways as a sum of consecutive naturals, for example, 5052777790 + ... + 5052777811.

It is an arithmetic number, because the mean of its divisors is an integer number (30316666806).

Almost surely, 2^111161111611 is an apocalyptic number.

111161111611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111161111611 is a deficient number, since it is larger than the sum of its proper divisors (10105555613).

111161111611 is a wasteful number, since it uses less digits than its factorization.

111161111611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105555612.

The product of its digits is 36, while the sum is 22.

Multiplying 111161111611 by its sum of digits (22), we get a palindrome (2445544455442).

Adding to 111161111611 its reverse (116111161111), we get a palindrome (227272272722).

It can be divided in two parts, 11 and 1161111611, that multiplied together give a palindrome (12772227721).

The spelling of 111161111611 in words is "one hundred eleven billion, one hundred sixty-one million, one hundred eleven thousand, six hundred eleven".