16684664455 has 4 divisors (see below), whose sum is σ = 20021597352. Its totient is φ = 13347731560.

The previous prime is 16684664413. The next prime is 16684664509. The reversal of 16684664455 is 55446648661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16684664455 - 2²¹ = 16682567303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16684664396 and 16684664405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668466441 + ... + 1668466450.

It is an arithmetic number, because the mean of its divisors is an integer number (5005399338).

Almost surely, 2^16684664455 is an apocalyptic number.

16684664455 is a deficient number, since it is larger than the sum of its proper divisors (3336932897).

16684664455 is an equidigital number, since it uses as much as digits as its factorization.

16684664455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336932896.

The product of its digits is 16588800, while the sum is 55.

The spelling of 16684664455 in words is "sixteen billion, six hundred eighty-four million, six hundred sixty-four thousand, four hundred fifty-five".