16909656784 has 80 divisors (see below), whose sum is σ = 35298633600. Its totient is φ = 7822683648.

The previous prime is 16909656767. The next prime is 16909656809. The reversal of 16909656784 is 48765690961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3687357 + ... + 3691939.

It is an arithmetic number, because the mean of its divisors is an integer number (441232920).

Almost surely, 2^16909656784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16909656784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17649316800).

16909656784 is an abundant number, since it is smaller than the sum of its proper divisors (18388976816).

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

16909656784 is a wasteful number, since it uses less digits than its factorization.

16909656784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892 (or 4886 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 16909656784 in words is "sixteen billion, nine hundred nine million, six hundred fifty-six thousand, seven hundred eighty-four".