111065656661 has 4 divisors (see below), whose sum is σ = 111066333612. Its totient is φ = 111064979712.

The previous prime is 111065656649. The next prime is 111065656679. The reversal of 111065656661 is 166656560111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 49208992561 + 61856664100 = 221831^2 + 248710^2 .

It is a cyclic number.

It is not a de Polignac number, because 111065656661 - 2²² = 111061462357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111065656561) 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, 80501 + ... + 478133.

It is an arithmetic number, because the mean of its divisors is an integer number (27766583403).

Almost surely, 2^111065656661 is an apocalyptic number.

It is an amenable number.

111065656661 is a deficient number, since it is larger than the sum of its proper divisors (676951).

111065656661 is an equidigital number, since it uses as much as digits as its factorization.

111065656661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676950.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 111065656661 in words is "one hundred eleven billion, sixty-five million, six hundred fifty-six thousand, six hundred sixty-one".