111866155720 has 128 divisors (see below), whose sum is σ = 277859134080. Its totient is φ = 40195584000.

The previous prime is 111866155663. The next prime is 111866155727. The reversal of 111866155720 is 27551668111.

111866155720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (111866155727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13887214 + ... + 13895266.

It is an arithmetic number, because the mean of its divisors is an integer number (2170774485).

Almost surely, 2^111866155720 is an apocalyptic number.

111866155720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111866155720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138929567040).

111866155720 is an abundant number, since it is smaller than the sum of its proper divisors (165992978360).

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

111866155720 is a wasteful number, since it uses less digits than its factorization.

111866155720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8447 (or 8443 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 111866155720 in words is "one hundred eleven billion, eight hundred sixty-six million, one hundred fifty-five thousand, seven hundred twenty".