115665 has 16 divisors (see below), whose sum is σ = 202176. Its totient is φ = 56000.

The previous prime is 115663. The next prime is 115679. The reversal of 115665 is 566511.

It is not a de Polignac number, because 115665 - 2¹ = 115663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (12636).

2¹¹⁵⁶⁶⁵ is an apocalyptic number.

115665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115665 is a deficient number, since it is larger than the sum of its proper divisors (86511).

115665 is a wasteful number, since it uses less digits than its factorization.

115665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its digits is 900, while the sum is 24.

The square root of 115665 is about 340.0955748021. The cubic root of 115665 is about 48.7229962216.

It can be divided in two parts, 1156 and 65, that added together give a palindrome (1221).

The spelling of 115665 in words is "one hundred fifteen thousand, six hundred sixty-five".