16728664317 has 16 divisors (see below), whose sum is σ = 22513720320. Its totient is φ = 11048371632.

The previous prime is 16728664289. The next prime is 16728664367. The reversal of 16728664317 is 71346682761.

It is a happy number.

It is not a de Polignac number, because 16728664317 - 2⁷ = 16728664189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16728664317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16728664367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151788 + ... + 237690.

It is an arithmetic number, because the mean of its divisors is an integer number (1407107520).

Almost surely, 2^16728664317 is an apocalyptic number.

It is an amenable number.

16728664317 is a deficient number, since it is larger than the sum of its proper divisors (5785056003).

16728664317 is a wasteful number, since it uses less digits than its factorization.

16728664317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86512.

The product of its digits is 2032128, while the sum is 51.

The spelling of 16728664317 in words is "sixteen billion, seven hundred twenty-eight million, six hundred sixty-four thousand, three hundred seventeen".