65561116567 has 4 divisors (see below), whose sum is σ = 68411599920. Its totient is φ = 62710633216.

The previous prime is 65561116549. The next prime is 65561116571. The reversal of 65561116567 is 76561116556.

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 65561116567 - 2¹¹ = 65561114519 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 65561116567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561116507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1425241642 + ... + 1425241687.

It is an arithmetic number, because the mean of its divisors is an integer number (17102899980).

Almost surely, 2^65561116567 is an apocalyptic number.

65561116567 is a deficient number, since it is larger than the sum of its proper divisors (2850483353).

65561116567 is a wasteful number, since it uses less digits than its factorization.

65561116567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850483352.

The product of its digits is 1134000, while the sum is 49.

The spelling of 65561116567 in words is "sixty-five billion, five hundred sixty-one million, one hundred sixteen thousand, five hundred sixty-seven".