8666198309 has 2 divisors, whose sum is σ = 8666198310. Its totient is φ = 8666198308.

The previous prime is 8666198297. The next prime is 8666198377. The reversal of 8666198309 is 9038916668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7357350625 + 1308847684 = 85775^2 + 36178^2 .

It is a cyclic number.

It is not a de Polignac number, because 8666198309 - 2⁴ = 8666198293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8666198809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333099154 + 4333099155.

It is an arithmetic number, because the mean of its divisors is an integer number (4333099155).

Almost surely, 2^8666198309 is an apocalyptic number.

It is an amenable number.

8666198309 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666198309 is an equidigital number, since it uses as much as digits as its factorization.

8666198309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 8666198309 is about 93092.4181069543. The cubic root of 8666198309 is about 2054.0430468855.

The spelling of 8666198309 in words is "eight billion, six hundred sixty-six million, one hundred ninety-eight thousand, three hundred nine".