111666222440 has 128 divisors (see below), whose sum is σ = 270752816160. Its totient is φ = 41297117184.

The previous prime is 111666222413. The next prime is 111666222469. The reversal of 111666222440 is 44222666111.

It can be written as a sum of positive squares in 16 ways, for example, as 83406595204 + 28259627236 = 288802^2 + 168106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 111666222440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12753104 + ... + 12761856.

Almost surely, 2^111666222440 is an apocalyptic number.

111666222440 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 111666222440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135376408080).

111666222440 is an abundant number, since it is smaller than the sum of its proper divisors (159086593720).

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

111666222440 is a wasteful number, since it uses less digits than its factorization.

111666222440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9111 (or 9107 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

Adding to 111666222440 its reverse (44222666111), we get a palindrome (155888888551).

The spelling of 111666222440 in words is "one hundred eleven billion, six hundred sixty-six million, two hundred twenty-two thousand, four hundred forty".