16609321773 has 12 divisors (see below), whose sum is σ = 26172264768. Its totient is φ = 10066255560.

The previous prime is 16609321723. The next prime is 16609321801. The reversal of 16609321773 is 37712390661.

16609321773 is a `hidden beast` number, since 1 + 6 + 609 + 32 + 1 + 7 + 7 + 3 = 666.

It is not a de Polignac number, because 16609321773 - 2¹² = 16609317677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16609321723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83885365 + ... + 83885562.

It is an arithmetic number, because the mean of its divisors is an integer number (2181022064).

Almost surely, 2^16609321773 is an apocalyptic number.

It is an amenable number.

16609321773 is a deficient number, since it is larger than the sum of its proper divisors (9562942995).

16609321773 is a wasteful number, since it uses less digits than its factorization.

16609321773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167770944 (or 167770941 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 16609321773 in words is "sixteen billion, six hundred nine million, three hundred twenty-one thousand, seven hundred seventy-three".