16606561646561 has 16 divisors (see below), whose sum is σ = 17027296588800. Its totient is φ = 16188715915008.

The previous prime is 16606561646527. The next prime is 16606561646617. The reversal of 16606561646561 is 16564616560661.

16606561646561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16606561646561 - 2¹⁰ = 16606561645537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16606561646561.

It is not an unprimeable number, because it can be changed into a prime (16606561646161) 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, 18524600 + ... + 19400358.

It is an arithmetic number, because the mean of its divisors is an integer number (1064206036800).

Almost surely, 2^{16606561646561} is an apocalyptic number.

It is an amenable number.

16606561646561 is a deficient number, since it is larger than the sum of its proper divisors (420734942239).

16606561646561 is a wasteful number, since it uses less digits than its factorization.

16606561646561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877408.

The product of its (nonzero) digits is 27993600, while the sum is 59.

The spelling of 16606561646561 in words is "sixteen trillion, six hundred six billion, five hundred sixty-one million, six hundred forty-six thousand, five hundred sixty-one".