65561116553 has 32 divisors (see below), whose sum is σ = 70260480000. Its totient is φ = 61056737280.

The previous prime is 65561116549. The next prime is 65561116571. The reversal of 65561116553 is 35561116556.

It is a cyclic number.

It is not a de Polignac number, because 65561116553 - 2² = 65561116549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65561116253) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 102279113 + ... + 102279753.

It is an arithmetic number, because the mean of its divisors is an integer number (2195640000).

Almost surely, 2^65561116553 is an apocalyptic number.

It is an amenable number.

65561116553 is a deficient number, since it is larger than the sum of its proper divisors (4699363447).

65561116553 is a wasteful number, since it uses less digits than its factorization.

65561116553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385.

The product of its digits is 405000, while the sum is 44.

The spelling of 65561116553 in words is "sixty-five billion, five hundred sixty-one million, one hundred sixteen thousand, five hundred fifty-three".