16521006568 has 16 divisors (see below), whose sum is σ = 33792968160. Its totient is φ = 7509548400.

The previous prime is 16521006563. The next prime is 16521006577. The reversal of 16521006568 is 86560012561.

It is a self number, because there is not a number n which added to its sum of digits gives 16521006568.

It is not an unprimeable number, because it can be changed into a prime (16521006563) by changing a digit.

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, 93869268 + ... + 93869443.

It is an arithmetic number, because the mean of its divisors is an integer number (2112060510).

Almost surely, 2^16521006568 is an apocalyptic number.

It is an amenable number.

16521006568 is an abundant number, since it is smaller than the sum of its proper divisors (17271961592).

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

16521006568 is a wasteful number, since it uses less digits than its factorization.

16521006568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187738728 (or 187738724 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 16521006568 in words is "sixteen billion, five hundred twenty-one million, six thousand, five hundred sixty-eight".