16684566689 has 12 divisors (see below), whose sum is σ = 20252430144. Its totient is φ = 13679271144.

The previous prime is 16684566641. The next prime is 16684566709. The reversal of 16684566689 is 98666548661.

It is not a de Polignac number, because 16684566689 - 2¹² = 16684562593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16684566589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7401077 + ... + 7403330.

It is an arithmetic number, because the mean of its divisors is an integer number (1687702512).

Almost surely, 2^16684566689 is an apocalyptic number.

It is an amenable number.

16684566689 is a deficient number, since it is larger than the sum of its proper divisors (3567863455).

16684566689 is a wasteful number, since it uses less digits than its factorization.

16684566689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14804444 (or 14804437 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 65.

The spelling of 16684566689 in words is "sixteen billion, six hundred eighty-four million, five hundred sixty-six thousand, six hundred eighty-nine".