It is a sphenic number, since it is the product of 3 distinct primes.
It is a 2-Lehmer number, since φ(6601) divides (6601-1)2.
It is a cyclic number.
It is a Carmichael number.
It is a magnanimous number.
It is a deceptive number, since it divides R6600.
6601 is a lucky number.
It is a Poulet number, since it divides 26600-1.
26601 is an apocalyptic number.
6601 is the 41-st decagonal number.
It is an amenable number.
6601 is a wasteful number, since it uses less digits than its factorization.
6601 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 71.
The square root of 6601 is about 81.2465383878. The cubic root of 6601 is about 18.7587218682.
Adding to 6601 its reverse (1066), we get a palindrome (7667).
The spelling of 6601 in words is "six thousand, six hundred one".