65865 has 8 divisors (see below), whose sum is σ = 105408. Its totient is φ = 35120.

The previous prime is 65851. The next prime is 65867. The reversal of 65865 is 56856.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65865 - 2⁸ = 65609 is a prime.

It is a Curzon number.

65865 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65865.

It is not an unprimeable number, because it can be changed into a prime (65867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181 + ... + 2210.

It is an arithmetic number, because the mean of its divisors is an integer number (13176).

2⁶⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

65865 is a deficient number, since it is larger than the sum of its proper divisors (39543).

65865 is a wasteful number, since it uses less digits than its factorization.

65865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399.

The product of its digits is 7200, while the sum is 30.

The square root of 65865 is about 256.6417736846. The cubic root of 65865 is about 40.3848274889.

Subtracting from 65865 its reverse (56856), we obtain a palindrome (9009).

The spelling of 65865 in words is "sixty-five thousand, eight hundred sixty-five".