16521675666688 has 36 divisors (see below), whose sum is σ = 32980935401428. Its totient is φ = 8260306329600.

The previous prime is 16521675666607. The next prime is 16521675666751. The reversal of 16521675666688 is 88666657612561.

It can be written as a sum of positive squares in 2 ways, for example, as 6791069217024 + 9730606449664 = 2605968^2 + 3119392^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16521675666688.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925470 + ... + 6062242.

Almost surely, 2^{16521675666688} is an apocalyptic number.

It is an amenable number.

16521675666688 is a deficient number, since it is larger than the sum of its proper divisors (16459259734740).

16521675666688 is an equidigital number, since it uses as much as digits as its factorization.

16521675666688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152390 (or 4152376 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 73.

The spelling of 16521675666688 in words is "sixteen trillion, five hundred twenty-one billion, six hundred seventy-five million, six hundred sixty-six thousand, six hundred eighty-eight".