16684351643 has 2 divisors, whose sum is σ = 16684351644. Its totient is φ = 16684351642.

The previous prime is 16684351631. The next prime is 16684351657. The reversal of 16684351643 is 34615348661.

16684351643 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 is an emirp because it is prime and its reverse (34615348661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16684351643 - 2⁴ = 16684351627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16684351613) 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, 8342175821 + 8342175822.

It is an arithmetic number, because the mean of its divisors is an integer number (8342175822).

Almost surely, 2^16684351643 is an apocalyptic number.

16684351643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16684351643 is an equidigital number, since it uses as much as digits as its factorization.

16684351643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 47.

The spelling of 16684351643 in words is "sixteen billion, six hundred eighty-four million, three hundred fifty-one thousand, six hundred forty-three".