16671888666 has 40 divisors (see below), whose sum is σ = 37630111860. Its totient is φ = 5516724672.

The previous prime is 16671888659. The next prime is 16671888679. The reversal of 16671888666 is 66688817661.

It can be written as a sum of positive squares in 2 ways, for example, as 15468145641 + 1203743025 = 124371^2 + 34695^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 353401 + ... + 397788.

Almost surely, 2^16671888666 is an apocalyptic number.

16671888666 is an abundant number, since it is smaller than the sum of its proper divisors (20958223194).

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

16671888666 is a wasteful number, since it uses less digits than its factorization.

16671888666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751340 (or 751331 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 16671888666 in words is "sixteen billion, six hundred seventy-one million, eight hundred eighty-eight thousand, six hundred sixty-six".