111566661101 has 16 divisors (see below), whose sum is σ = 128844079104. Its totient is φ = 94625537904.

The previous prime is 111566661097. The next prime is 111566661119. The reversal of 111566661101 is 101166665111.

It is a cyclic number.

It is not a de Polignac number, because 111566661101 - 2² = 111566661097 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 (111566661121) 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, 864740 + ... + 985346.

It is an arithmetic number, because the mean of its divisors is an integer number (8052754944).

Almost surely, 2^111566661101 is an apocalyptic number.

It is an amenable number.

111566661101 is a deficient number, since it is larger than the sum of its proper divisors (17277418003).

111566661101 is a wasteful number, since it uses less digits than its factorization.

111566661101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122000.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 111566661101 in words is "one hundred eleven billion, five hundred sixty-six million, six hundred sixty-one thousand, one hundred one".