16221660111566 has 32 divisors (see below), whose sum is σ = 30980358843840. Its totient is φ = 6196071764736.

The previous prime is 16221660111563. The next prime is 16221660111647. The reversal of 16221660111566 is 66511106612261.

16221660111566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221660111563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1536718871 + ... + 1536729426.

It is an arithmetic number, because the mean of its divisors is an integer number (968136213870).

Almost surely, 2^{16221660111566} is an apocalyptic number.

16221660111566 is a deficient number, since it is larger than the sum of its proper divisors (14758698732274).

16221660111566 is a wasteful number, since it uses less digits than its factorization.

16221660111566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073448348.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 16221660111566 in words is "sixteen trillion, two hundred twenty-one billion, six hundred sixty million, one hundred eleven thousand, five hundred sixty-six".