111121656111 has 16 divisors (see below), whose sum is σ = 169073992800. Its totient is φ = 72078911424.

The previous prime is 111121656109. The next prime is 111121656133. The reversal of 111121656111 is 111656121111.

It is a happy number.

111121656111 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 2 + 1 + 656 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 111121656111 - 2¹ = 111121656109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121656311) 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, 55615446 + ... + 55617443.

It is an arithmetic number, because the mean of its divisors is an integer number (10567124550).

Almost surely, 2^111121656111 is an apocalyptic number.

111121656111 is a deficient number, since it is larger than the sum of its proper divisors (57952336689).

111121656111 is a wasteful number, since it uses less digits than its factorization.

111121656111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111232935 (or 111232929 counting only the distinct ones).

The product of its digits is 360, while the sum is 27.

Adding to 111121656111 its reverse (111656121111), we get a palindrome (222777777222).

The spelling of 111121656111 in words is "one hundred eleven billion, one hundred twenty-one million, six hundred fifty-six thousand, one hundred eleven".