111216666 has 24 divisors (see below), whose sum is σ = 244494432. Its totient is φ = 33701800.

The previous prime is 111216659. The next prime is 111216673. The reversal of 111216666 is 666612111.

It is an interprime number because it is at equal distance from previous prime (111216659) and next prime (111216673).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75870 + ... + 77321.

It is an arithmetic number, because the mean of its divisors is an integer number (10187268).

Almost surely, 2^111216666 is an apocalyptic number.

111216666 is an abundant number, since it is smaller than the sum of its proper divisors (133277766).

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

111216666 is a wasteful number, since it uses less digits than its factorization.

111216666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153218 (or 153207 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 111216666 is about 10545.9312533318. The cubic root of 111216666 is about 480.9020450798.

Adding to 111216666 its reverse (666612111), we get a palindrome (777828777).

The spelling of 111216666 in words is "one hundred eleven million, two hundred sixteen thousand, six hundred sixty-six".