111221834166 has 48 divisors (see below), whose sum is σ = 247731120000. Its totient is φ = 36037332864.

The previous prime is 111221834149. The next prime is 111221834167. The reversal of 111221834166 is 661438122111.

111221834166 is a `hidden beast` number, since 1 + 11 + 221 + 8 + 3 + 416 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111221834166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221834167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 619035 + ... + 778233.

It is an arithmetic number, because the mean of its divisors is an integer number (5161065000).

Almost surely, 2^111221834166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221834166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123865560000).

111221834166 is an abundant number, since it is smaller than the sum of its proper divisors (136509285834).

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

111221834166 is a wasteful number, since it uses less digits than its factorization.

111221834166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160293 (or 160290 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

Adding to 111221834166 its reverse (661438122111), we get a palindrome (772659956277).

The spelling of 111221834166 in words is "one hundred eleven billion, two hundred twenty-one million, eight hundred thirty-four thousand, one hundred sixty-six".