111666012 has 72 divisors (see below), whose sum is σ = 281102976. Its totient is φ = 34417152.

The previous prime is 111666011. The next prime is 111666017. The reversal of 111666012 is 210666111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1151148 + ... + 1151244.

It is an arithmetic number, because the mean of its divisors is an integer number (3904208).

Almost surely, 2^111666012 is an apocalyptic number.

111666012 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 111666012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140551488).

111666012 is an abundant number, since it is smaller than the sum of its proper divisors (169436964).

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

111666012 is a wasteful number, since it uses less digits than its factorization.

111666012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 111666012 is about 10567.2140131635. The cubic root of 111666012 is about 481.5488337510.

Subtracting 111666012 from its reverse (210666111), we obtain a palindrome (99000099).

The spelling of 111666012 in words is "one hundred eleven million, six hundred sixty-six thousand, twelve".