16564616560661 has 16 divisors (see below), whose sum is σ = 18015784402560. Its totient is φ = 15138735451200.

The previous prime is 16564616560651. The next prime is 16564616560673. The reversal of 16564616560661 is 16606561646561.

It is a cyclic number.

It is not a de Polignac number, because 16564616560661 - 2²⁶ = 16564549451797 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 16564616560661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564616560651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100465856 + ... + 100630598.

It is an arithmetic number, because the mean of its divisors is an integer number (1125986525160).

Almost surely, 2^{16564616560661} is an apocalyptic number.

It is an amenable number.

16564616560661 is a deficient number, since it is larger than the sum of its proper divisors (1451167841899).

16564616560661 is a wasteful number, since it uses less digits than its factorization.

16564616560661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241436.

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

The spelling of 16564616560661 in words is "sixteen trillion, five hundred sixty-four billion, six hundred sixteen million, five hundred sixty thousand, six hundred sixty-one".