111561661068 has 144 divisors (see below), whose sum is σ = 323685129600. Its totient is φ = 29563522560.

The previous prime is 111561661063. The next prime is 111561661097. The reversal of 111561661068 is 860166165111.

It is not an unprimeable number, because it can be changed into a prime (111561661063) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292248 + ... + 555456.

It is an arithmetic number, because the mean of its divisors is an integer number (2247813400).

Almost surely, 2^111561661068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111561661068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161842564800).

111561661068 is an abundant number, since it is smaller than the sum of its proper divisors (212123468532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111561661068 is a wasteful number, since it uses less digits than its factorization.

111561661068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263272 (or 263257 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 111561661068 in words is "one hundred eleven billion, five hundred sixty-one million, six hundred sixty-one thousand, sixty-eight".