111060615661 has 4 divisors (see below), whose sum is σ = 111065691132. Its totient is φ = 111055540192.

The previous prime is 111060615607. The next prime is 111060615689. The reversal of 111060615661 is 166516060111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166516060111 = 172001 ⋅968111.

It can be written as a sum of positive squares in 2 ways, for example, as 67303924900 + 43756690761 = 259430^2 + 209181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111060615661 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 (111060615161) 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, 2504770 + ... + 2548723.

It is an arithmetic number, because the mean of its divisors is an integer number (27766422783).

Almost surely, 2^111060615661 is an apocalyptic number.

It is an amenable number.

111060615661 is a deficient number, since it is larger than the sum of its proper divisors (5075471).

111060615661 is an equidigital number, since it uses as much as digits as its factorization.

111060615661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5075470.

The product of its (nonzero) digits is 6480, while the sum is 34.

Adding to 111060615661 its reverse (166516060111), we get a palindrome (277576675772).

The spelling of 111060615661 in words is "one hundred eleven billion, sixty million, six hundred fifteen thousand, six hundred sixty-one".