16505289668 has 12 divisors (see below), whose sum is σ = 33010579392. Its totient is φ = 7073695560.

The previous prime is 16505289637. The next prime is 16505289737. The reversal of 16505289668 is 86698250561.

16505289668 is an admirable number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294737288 + ... + 294737343.

It is an arithmetic number, because the mean of its divisors is an integer number (2750881616).

Almost surely, 2^16505289668 is an apocalyptic number.

It is an amenable number.

16505289668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16505289668 is a wasteful number, since it uses less digits than its factorization.

16505289668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589474642 (or 589474640 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 16505289668 in words is "sixteen billion, five hundred five million, two hundred eighty-nine thousand, six hundred sixty-eight".