111997981748772 has 144 divisors (see below), whose sum is σ = 324816393213312. Its totient is φ = 31874301550080.

The previous prime is 111997981748771. The next prime is 111997981748791. The reversal of 111997981748772 is 277847189799111.

111997981748772 is a `hidden beast` number, since 1 + 119 + 9 + 7 + 9 + 8 + 17 + 487 + 7 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 111997981748691 and 111997981748700.

It is not an unprimeable number, because it can be changed into a prime (111997981748771) 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, 104996103 + ... + 106057425.

Almost surely, 2^{111997981748772} is an apocalyptic number.

111997981748772 is a gapful number since it is divisible by the number (12) 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 111997981748772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162408196606656).

111997981748772 is an abundant number, since it is smaller than the sum of its proper divisors (212818411464540).

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

111997981748772 is a wasteful number, since it uses less digits than its factorization.

111997981748772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062978 (or 1062973 counting only the distinct ones).

The product of its digits is 896168448, while the sum is 81.

The spelling of 111997981748772 in words is "one hundred eleven trillion, nine hundred ninety-seven billion, nine hundred eighty-one million, seven hundred forty-eight thousand, seven hundred seventy-two".