16663129728 has 192 divisors, whose sum is σ = 52217161920. Its totient is φ = 4693463040.

The previous prime is 16663129699. The next prime is 16663129733. The reversal of 16663129728 is 82792136661.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1329700 + ... + 1342172.

It is an arithmetic number, because the mean of its divisors is an integer number (271964385).

Almost surely, 2^16663129728 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 16663129728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26108580960).

16663129728 is an abundant number, since it is smaller than the sum of its proper divisors (35554032192).

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

16663129728 is a wasteful number, since it uses less digits than its factorization.

16663129728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12575 (or 12556 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The spelling of 16663129728 in words is "sixteen billion, six hundred sixty-three million, one hundred twenty-nine thousand, seven hundred twenty-eight".