16721323166 has 8 divisors (see below), whose sum is σ = 25082564880. Its totient is φ = 8360468208.

The previous prime is 16721323153. The next prime is 16721323319. The reversal of 16721323166 is 66132312761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 66455 + ... + 194573.

It is an arithmetic number, because the mean of its divisors is an integer number (3135320610).

Almost surely, 2^16721323166 is an apocalyptic number.

16721323166 is a deficient number, since it is larger than the sum of its proper divisors (8361241714).

16721323166 is a wasteful number, since it uses less digits than its factorization.

16721323166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193378.

The product of its digits is 54432, while the sum is 38.

The spelling of 16721323166 in words is "sixteen billion, seven hundred twenty-one million, three hundred twenty-three thousand, one hundred sixty-six".