111216665 has 8 divisors (see below), whose sum is σ = 152525760. Its totient is φ = 76262832.

The previous prime is 111216659. The next prime is 111216673. The reversal of 111216665 is 566612111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111216665 - 2⁴ = 111216649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1588775 + ... + 1588844.

It is an arithmetic number, because the mean of its divisors is an integer number (19065720).

Almost surely, 2^111216665 is an apocalyptic number.

It is an amenable number.

111216665 is a deficient number, since it is larger than the sum of its proper divisors (41309095).

111216665 is an equidigital number, since it uses as much as digits as its factorization.

111216665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3177631.

The product of its digits is 2160, while the sum is 29.

The square root of 111216665 is about 10545.9312059201. The cubic root of 111216665 is about 480.9020436385.

Adding to 111216665 its reverse (566612111), we get a palindrome (677828776).

The spelling of 111216665 in words is "one hundred eleven million, two hundred sixteen thousand, six hundred sixty-five".