16659945816 has 24 divisors (see below), whose sum is σ = 41651445420. Its totient is φ = 5553104496.

The previous prime is 16659945811. The next prime is 16659945823. The reversal of 16659945816 is 61854995661.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 16659945816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16659945811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 619155 + ... + 645501.

Almost surely, 2^16659945816 is an apocalyptic number.

It is an amenable number.

16659945816 is an abundant number, since it is smaller than the sum of its proper divisors (24991499604).

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

16659945816 is an frugal number, since it uses more digits than its factorization.

16659945816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52703 (or 26352 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 60.

The spelling of 16659945816 in words is "sixteen billion, six hundred fifty-nine million, nine hundred forty-five thousand, eight hundred sixteen".