66005 has 8 divisors (see below), whose sum is σ = 81312. Its totient is φ = 51408.

The previous prime is 65993. The next prime is 66029. The reversal of 66005 is 50066.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66005 - 2¹² = 61909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62 + ... + 368.

It is an arithmetic number, because the mean of its divisors is an integer number (10164).

2⁶⁶⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

66005 is a deficient number, since it is larger than the sum of its proper divisors (15307).

66005 is a wasteful number, since it uses less digits than its factorization.

66005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 66005 is about 256.9143826258. The cubic root of 66005 is about 40.4134206956.

The spelling of 66005 in words is "sixty-six thousand, five".