116665 has 4 divisors (see below), whose sum is σ = 140004. Its totient is φ = 93328.

The previous prime is 116663. The next prime is 116681. The reversal of 116665 is 566611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566611 = 43 ⋅13177.

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 97344 = 139^2 + 312^2 .

It is a cyclic number.

It is not a de Polignac number, because 116665 - 2¹ = 116663 is a prime.

It is a super-2 number, since 2×116665² = 27221444450, which contains 22 as substring.

It is a Duffinian number.

116665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (116663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11662 + ... + 11671.

It is an arithmetic number, because the mean of its divisors is an integer number (35001).

2¹¹⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

116665 is a deficient number, since it is larger than the sum of its proper divisors (23339).

116665 is an equidigital number, since it uses as much as digits as its factorization.

116665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23338.

The product of its digits is 1080, while the sum is 25.

The square root of 116665 is about 341.5625857731. The cubic root of 116665 is about 48.8630076127.

The spelling of 116665 in words is "one hundred sixteen thousand, six hundred sixty-five".