66008209 has 8 divisors (see below), whose sum is σ = 66894408. Its totient is φ = 65126400.

The previous prime is 66008191. The next prime is 66008227. The reversal of 66008209 is 90280066.

It is an interprime number because it is at equal distance from previous prime (66008191) and next prime (66008227).

It can be written as a sum of positive squares in 4 ways, for example, as 47059600 + 18948609 = 6860^2 + 4353^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66008209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66008009) 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, 38049 + ... + 39745.

It is an arithmetic number, because the mean of its divisors is an integer number (8361801).

Almost surely, 2^66008209 is an apocalyptic number.

It is an amenable number.

66008209 is a deficient number, since it is larger than the sum of its proper divisors (886199).

66008209 is a wasteful number, since it uses less digits than its factorization.

66008209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 66008209 is about 8124.5436179517. The cubic root of 66008209 is about 404.1407561855.

The spelling of 66008209 in words is "sixty-six million, eight thousand, two hundred nine".