6565116666645 has 144 divisors (see below), whose sum is σ = 12272538685680. Its totient is φ = 3368429577216.

The previous prime is 6565116666631. The next prime is 6565116666649. The reversal of 6565116666645 is 5466666115656.

It can be written as a sum of positive squares in 8 ways, for example, as 238010306769 + 6327106359876 = 487863^2 + 2515374^2 .

It is not a de Polignac number, because 6565116666645 - 2⁷ = 6565116666517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6565116666649) 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 143 ways as a sum of consecutive naturals, for example, 107996479 + ... + 108057251.

It is an arithmetic number, because the mean of its divisors is an integer number (85225963095).

Almost surely, 2^{6565116666645} is an apocalyptic number.

It is an amenable number.

6565116666645 is a deficient number, since it is larger than the sum of its proper divisors (5707422019035).

6565116666645 is an frugal number, since it uses more digits than its factorization.

6565116666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60928 (or 60907 counting only the distinct ones).

The product of its digits is 139968000, while the sum is 63.

The spelling of 6565116666645 in words is "six trillion, five hundred sixty-five billion, one hundred sixteen million, six hundred sixty-six thousand, six hundred forty-five".