200666209 has 4 divisors (see below), whose sum is σ = 201050416. Its totient is φ = 200282004.

The previous prime is 200666173. The next prime is 200666233. The reversal of 200666209 is 902666002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200666209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200666009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191319 + ... + 192364.

It is an arithmetic number, because the mean of its divisors is an integer number (50262604).

Almost surely, 2^200666209 is an apocalyptic number.

It is an amenable number.

200666209 is a deficient number, since it is larger than the sum of its proper divisors (384207).

200666209 is an equidigital number, since it uses as much as digits as its factorization.

200666209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384206.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 200666209 is about 14165.6700865155. The cubic root of 200666209 is about 585.4521636296.

The spelling of 200666209 in words is "two hundred million, six hundred sixty-six thousand, two hundred nine".