16566656005563 has 8 divisors (see below), whose sum is σ = 22091424503808. Its totient is φ = 11043162422184.

The previous prime is 16566656005561. The next prime is 16566656005589. The reversal of 16566656005563 is 36550065666561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16566656005563 - 2¹ = 16566656005561 is a prime.

It is a super-2 number, since 2×16566656005563² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16566656005497 and 16566656005506.

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 7 ways as a sum of consecutive naturals, for example, 318698395 + ... + 318750372.

It is an arithmetic number, because the mean of its divisors is an integer number (2761428062976).

Almost surely, 2^{16566656005563} is an apocalyptic number.

16566656005563 is a deficient number, since it is larger than the sum of its proper divisors (5524768498245).

16566656005563 is an equidigital number, since it uses as much as digits as its factorization.

16566656005563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637457433.

The product of its (nonzero) digits is 87480000, while the sum is 60.

The spelling of 16566656005563 in words is "sixteen trillion, five hundred sixty-six billion, six hundred fifty-six million, five thousand, five hundred sixty-three".