41665 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.
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 2k-41665 is a prime.
It is a Duffinian number.
It is a congruent number.
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 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 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".