41665 has 8 divisors (see below), whose sum is σ = 53928. Its totient is φ = 30720.

The previous prime is 41659. The next prime is 41669. The reversal of 41665 is 56614.

41665 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 36481 = 72^2 + 191^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-41665 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256 + ... + 385.

It is an arithmetic number, because the mean of its divisors is an integer number (6741).

41665 is a Friedman number, since it can be written as 641*65, using all its digits and the basic arithmetic operations.

It is a Poulet number, since it divides 2⁴¹⁶⁶⁴-1.

2⁴¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

41665 is a deficient number, since it is larger than the sum of its proper divisors (12263).

41665 is a wasteful number, since it uses less digits than its factorization.

41665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 720, while the sum is 22.

The square root of 41665 is about 204.1200627082. The cubic root of 41665 is about 34.6676014705.

The spelling of 41665 in words is "forty-one thousand, six hundred sixty-five".