16221785775916 has 24 divisors (see below), whose sum is σ = 32528280637440. Its totient is φ = 6934041957072.

The previous prime is 16221785775911. The next prime is 16221785775959. The reversal of 16221785775916 is 61957758712261.

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16221785775911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756320206 + ... + 756341653.

It is an arithmetic number, because the mean of its divisors is an integer number (1355345026560).

Almost surely, 2^{16221785775916} is an apocalyptic number.

It is an amenable number.

16221785775916 is an abundant number, since it is smaller than the sum of its proper divisors (16306494861524).

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

16221785775916 is a wasteful number, since it uses less digits than its factorization.

16221785775916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512662253 (or 1512662251 counting only the distinct ones).

The product of its digits is 88905600, while the sum is 67.

The spelling of 16221785775916 in words is "sixteen trillion, two hundred twenty-one billion, seven hundred eighty-five million, seven hundred seventy-five thousand, nine hundred sixteen".