111216660 has 24 divisors (see below), whose sum is σ = 311406816. Its totient is φ = 29657760.

The previous prime is 111216659. The next prime is 111216673. The reversal of 111216660 is 66612111.

It is a self number, because there is not a number n which added to its sum of digits gives 111216660.

It is a congruent 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, 926746 + ... + 926865.

It is an arithmetic number, because the mean of its divisors is an integer number (12975284).

Almost surely, 2^111216660 is an apocalyptic number.

111216660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111216660 is an abundant number, since it is smaller than the sum of its proper divisors (200190156).

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

111216660 is a wasteful number, since it uses less digits than its factorization.

111216660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853623 (or 1853621 counting only the distinct ones).

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

The square root of 111216660 is about 10545.9309688619. The cubic root of 111216660 is about 480.9020364318.

Adding to 111216660 its reverse (66612111), we get a palindrome (177828771).

The spelling of 111216660 in words is "one hundred eleven million, two hundred sixteen thousand, six hundred sixty".