64665 has 16 divisors (see below), whose sum is σ = 115200. Its totient is φ = 34416.

The previous prime is 64663. The next prime is 64667. The reversal of 64665 is 56646.

It is an interprime number because it is at equal distance from previous prime (64663) and next prime (64667).

It is not a de Polignac number, because 64665 - 2¹ = 64663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64665.

It is not an unprimeable number, because it can be changed into a prime (64661) 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, 105 + ... + 374.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

2⁶⁴⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

64665 is a deficient number, since it is larger than the sum of its proper divisors (50535).

64665 is a wasteful number, since it uses less digits than its factorization.

64665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 487 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 64665 is about 254.2931379334. The cubic root of 64665 is about 40.1380645727.

It can be divided in two parts, 64 and 665, that added together give a 6-th power (729 = 3⁶).

The spelling of 64665 in words is "sixty-four thousand, six hundred sixty-five".