16684566589 has 2 divisors, whose sum is σ = 16684566590. Its totient is φ = 16684566588.

The previous prime is 16684566583. The next prime is 16684566601. The reversal of 16684566589 is 98566548661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15962300964 + 722265625 = 126342^2 + 26875^2 .

It is a cyclic number.

It is not a de Polignac number, because 16684566589 - 2⁷ = 16684566461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16684566589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16684566583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342283294 + 8342283295.

It is an arithmetic number, because the mean of its divisors is an integer number (8342283295).

Almost surely, 2^16684566589 is an apocalyptic number.

It is an amenable number.

16684566589 is a deficient number, since it is larger than the sum of its proper divisors (1).

16684566589 is an equidigital number, since it uses as much as digits as its factorization.

16684566589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74649600, while the sum is 64.

The spelling of 16684566589 in words is "sixteen billion, six hundred eighty-four million, five hundred sixty-six thousand, five hundred eighty-nine".