16684566641 has 2 divisors, whose sum is σ = 16684566642. Its totient is φ = 16684566640.

The previous prime is 16684566631. The next prime is 16684566709. The reversal of 16684566641 is 14666548661.

16684566641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12800659600 + 3883907041 = 113140^2 + 62321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16684566641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16684566601) 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 as a sum of consecutive naturals, namely, 8342283320 + 8342283321.

It is an arithmetic number, because the mean of its divisors is an integer number (8342283321).

Almost surely, 2^16684566641 is an apocalyptic number.

It is an amenable number.

16684566641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16684566641 is an equidigital number, since it uses as much as digits as its factorization.

16684566641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 53.

The spelling of 16684566641 in words is "sixteen billion, six hundred eighty-four million, five hundred sixty-six thousand, six hundred forty-one".