16720585563728 has 20 divisors (see below), whose sum is σ = 32396519148180. Its totient is φ = 8360193525504.

The previous prime is 16720585563697. The next prime is 16720585563757. The reversal of 16720585563728 is 82736558502761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5205096235024 + 11515489328704 = 2281468^2 + 3393448^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4804175 + ... + 7518062.

It is an arithmetic number, because the mean of its divisors is an integer number (1619825957409).

Almost surely, 2^{16720585563728} is an apocalyptic number.

It is an amenable number.

16720585563728 is a deficient number, since it is larger than the sum of its proper divisors (15675933584452).

16720585563728 is a wasteful number, since it uses less digits than its factorization.

16720585563728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12407054 (or 12407048 counting only the distinct ones).

The product of its (nonzero) digits is 169344000, while the sum is 65.

The spelling of 16720585563728 in words is "sixteen trillion, seven hundred twenty billion, five hundred eighty-five million, five hundred sixty-three thousand, seven hundred twenty-eight".