16434065561 has 16 divisors (see below), whose sum is σ = 17374304640. Its totient is φ = 15501507840.

The previous prime is 16434065519. The next prime is 16434065581. The reversal of 16434065561 is 16556043461.

It is a cyclic number.

It is not a de Polignac number, because 16434065561 - 2¹⁸ = 16433803417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16434065581) 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 15 ways as a sum of consecutive naturals, for example, 5264081 + ... + 5267201.

It is an arithmetic number, because the mean of its divisors is an integer number (1085894040).

Almost surely, 2^16434065561 is an apocalyptic number.

It is an amenable number.

16434065561 is a deficient number, since it is larger than the sum of its proper divisors (940239079).

16434065561 is a wasteful number, since it uses less digits than its factorization.

16434065561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 16434065561 in words is "sixteen billion, four hundred thirty-four million, sixty-five thousand, five hundred sixty-one".