111660 has 24 divisors (see below), whose sum is σ = 312816. Its totient is φ = 29760.

The previous prime is 111659. The next prime is 111667. The reversal of 111660 is 66111.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 111660.

It is not an unprimeable number, because it can be changed into a prime (111667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 990.

It is an arithmetic number, because the mean of its divisors is an integer number (13034).

2¹¹¹⁶⁶⁰ is an apocalyptic number.

111660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111660 is an abundant number, since it is smaller than the sum of its proper divisors (201156).

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

111660 is a wasteful number, since it uses less digits than its factorization.

111660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 111660 is about 334.1556523538. The cubic root of 111660 is about 48.1540191541.

Adding to 111660 its reverse (66111), we get a palindrome (177771).

It can be divided in two parts, 1116 and 60, that added together give a triangular number (1176 = T₄₈).

The spelling of 111660 in words is "one hundred eleven thousand, six hundred sixty".