16684566663 has 8 divisors (see below), whose sum is σ = 22248544000. Its totient is φ = 11121816888.

The previous prime is 16684566641. The next prime is 16684566709. The reversal of 16684566663 is 36666548661.

It is a happy number.

16684566663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16684566663 - 2⁵ = 16684566631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16684566623) 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 in 7 ways as a sum of consecutive naturals, for example, 274693 + ... + 329886.

It is an arithmetic number, because the mean of its divisors is an integer number (2781068000).

Almost surely, 2^16684566663 is an apocalyptic number.

16684566663 is a deficient number, since it is larger than the sum of its proper divisors (5563977337).

16684566663 is an equidigital number, since it uses as much as digits as its factorization.

16684566663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613781.

The product of its digits is 22394880, while the sum is 57.

The spelling of 16684566663 in words is "sixteen billion, six hundred eighty-four million, five hundred sixty-six thousand, six hundred sixty-three".