66563836566 has 96 divisors (see below), whose sum is σ = 144204727680. Its totient is φ = 20474471424.

The previous prime is 66563836501. The next prime is 66563836567.

66563836566 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66563836567) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27068245 + ... + 27070703.

It is an arithmetic number, because the mean of its divisors is an integer number (1502132580).

Almost surely, 2^66563836566 is an apocalyptic number.

66563836566 is an abundant number, since it is smaller than the sum of its proper divisors (77640891114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66563836566 is a wasteful number, since it uses less digits than its factorization.

66563836566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798 (or 2781 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 60.

The spelling of 66563836566 in words is "sixty-six billion, five hundred sixty-three million, eight hundred thirty-six thousand, five hundred sixty-six".