16609881808 has 20 divisors (see below), whose sum is σ = 34657157668. Its totient is φ = 7666099200.

The previous prime is 16609881797. The next prime is 16609881853. The reversal of 16609881808 is 80818890661.

It can be written as a sum of positive squares in 2 ways, for example, as 7407700624 + 9202181184 = 86068^2 + 95928^2 .

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, 39927393 + ... + 39927808.

Almost surely, 2^16609881808 is an apocalyptic number.

It is an amenable number.

16609881808 is an abundant number, since it is smaller than the sum of its proper divisors (18047275860).

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

16609881808 is a wasteful number, since it uses less digits than its factorization.

16609881808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79855222 (or 79855216 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 55.

The spelling of 16609881808 in words is "sixteen billion, six hundred nine million, eight hundred eighty-one thousand, eight hundred eight".