16391168784 has 135 divisors (see below), whose sum is σ = 47076666247. Its totient is φ = 5323916352.

The previous prime is 16391168779. The next prime is 16391168803. The reversal of 16391168784 is 48786119361.

The square root of 16391168784 is 128028.

It is a perfect power (a square), and thus also a powerful number.

16391168784 is a `hidden beast` number, since 16 + 391 + 168 + 7 + 84 = 666.

16391168784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16391168784.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 72207679 + ... + 72207905.

Almost surely, 2^16391168784 is an apocalyptic number.

16391168784 is the 128028-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16391168784

16391168784 is an abundant number, since it is smaller than the sum of its proper divisors (30685497463).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16391168784 is an equidigital number, since it uses as much as digits as its factorization.

16391168784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 279 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 16391168784 in words is "sixteen billion, three hundred ninety-one million, one hundred sixty-eight thousand, seven hundred eighty-four".