16566656005564 has 48 divisors (see below), whose sum is σ = 34204761077760. Its totient is φ = 6870434460480.

The previous prime is 16566656005561. The next prime is 16566656005589. The reversal of 16566656005564 is 46550065666561.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10650639 + ... + 12106585.

It is an arithmetic number, because the mean of its divisors is an integer number (712599189120).

Almost surely, 2^{16566656005564} is an apocalyptic number.

16566656005564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16566656005564 is an abundant number, since it is smaller than the sum of its proper divisors (17638105072196).

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

16566656005564 is a wasteful number, since it uses less digits than its factorization.

16566656005564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469098 (or 1469096 counting only the distinct ones).

The product of its (nonzero) digits is 116640000, while the sum is 61.

The spelling of 16566656005564 in words is "sixteen trillion, five hundred sixty-six billion, six hundred fifty-six million, five thousand, five hundred sixty-four".