65561116565 has 16 divisors (see below), whose sum is σ = 89942814720. Its totient is φ = 44940981120.

The previous prime is 65561116549. The next prime is 65561116571. The reversal of 65561116565 is 56561116556.

It is not a de Polignac number, because 65561116565 - 2⁴ = 65561116549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211541 + ... + 419370.

It is an arithmetic number, because the mean of its divisors is an integer number (5621425920).

Almost surely, 2^65561116565 is an apocalyptic number.

It is an amenable number.

65561116565 is a deficient number, since it is larger than the sum of its proper divisors (24381698155).

65561116565 is a wasteful number, since it uses less digits than its factorization.

65561116565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633892.

The product of its digits is 810000, while the sum is 47.

Subtracting from 65561116565 its reverse (56561116556), we obtain a palindrome (9000000009).

The spelling of 65561116565 in words is "sixty-five billion, five hundred sixty-one million, one hundred sixteen thousand, five hundred sixty-five".