16556328534563 has 4 divisors (see below), whose sum is σ = 16627385738808. Its totient is φ = 16485271330320.

The previous prime is 16556328534539. The next prime is 16556328534643. The reversal of 16556328534563 is 36543582365561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16556328534563 - 2¹⁴ = 16556328518179 is a prime.

It is a super-2 number, since 2×16556328534563² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16556328534496 and 16556328534505.

It is not an unprimeable number, because it can be changed into a prime (16556328530563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35528601773 + ... + 35528602238.

It is an arithmetic number, because the mean of its divisors is an integer number (4156846434702).

Almost surely, 2^{16556328534563} is an apocalyptic number.

16556328534563 is a deficient number, since it is larger than the sum of its proper divisors (71057204245).

16556328534563 is an equidigital number, since it uses as much as digits as its factorization.

16556328534563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71057204244.

The product of its digits is 233280000, while the sum is 62.

The spelling of 16556328534563 in words is "sixteen trillion, five hundred fifty-six billion, three hundred twenty-eight million, five hundred thirty-four thousand, five hundred sixty-three".