16566656005560 has 128 divisors (see below), whose sum is σ = 50097436139520. Its totient is φ = 4382452956672.

The previous prime is 16566656005483. The next prime is 16566656005561. The reversal of 16566656005560 is 6550065666561.

It is a self number, because there is not a number n which added to its sum of digits gives 16566656005560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566656005561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133242142 + ... + 133366418.

It is an arithmetic number, because the mean of its divisors is an integer number (391386219840).

Almost surely, 2^{16566656005560} is an apocalyptic number.

16566656005560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16566656005560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25048718069760).

16566656005560 is an abundant number, since it is smaller than the sum of its proper divisors (33530780133960).

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

16566656005560 is a wasteful number, since it uses less digits than its factorization.

16566656005560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133165 (or 133161 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 16566656005560 in words is "sixteen trillion, five hundred sixty-six billion, six hundred fifty-six million, five thousand, five hundred sixty".