86665 has 4 divisors (see below), whose sum is σ = 104004. Its totient is φ = 69328.

The previous prime is 86629. The next prime is 86677. The reversal of 86665 is 56668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15376 + 71289 = 124^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 86665 - 2¹⁵ = 53897 is a prime.

It is a d-powerful number, because it can be written as 8³ + 6² + 6³ + 6⁵ + 5⁷ .

It is a Duffinian number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8662 + ... + 8671.

It is an arithmetic number, because the mean of its divisors is an integer number (26001).

2⁸⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

86665 is a deficient number, since it is larger than the sum of its proper divisors (17339).

86665 is a wasteful number, since it uses less digits than its factorization.

86665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17338.

The product of its digits is 8640, while the sum is 31.

The square root of 86665 is about 294.3891981714. The cubic root of 86665 is about 44.2535294620.

The spelling of 86665 in words is "eighty-six thousand, six hundred sixty-five".