65561116568 has 64 divisors (see below), whose sum is σ = 128847697920. Its totient is φ = 31235500800.

The previous prime is 65561116549. The next prime is 65561116571. The reversal of 65561116568 is 86561116556.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16778471 + ... + 16782377.

It is an arithmetic number, because the mean of its divisors is an integer number (2013245280).

Almost surely, 2^65561116568 is an apocalyptic number.

It is an amenable number.

65561116568 is a deficient number, since it is larger than the sum of its proper divisors (63286581352).

65561116568 is a wasteful number, since it uses less digits than its factorization.

65561116568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968 (or 4964 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 50.

The spelling of 65561116568 in words is "sixty-five billion, five hundred sixty-one million, one hundred sixteen thousand, five hundred sixty-eight".