66536863566 has 16 divisors (see below), whose sum is σ = 133076514000. Its totient is φ = 22178490048.

The previous prime is 66536863537. The next prime is 66536863573.

66536863566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320610 + ... + 485658.

It is an arithmetic number, because the mean of its divisors is an integer number (8317282125).

Almost surely, 2^66536863566 is an apocalyptic number.

66536863566 is an abundant number, since it is smaller than the sum of its proper divisors (66539650434).

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

66536863566 is a wasteful number, since it uses less digits than its factorization.

66536863566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232243.

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

The spelling of 66536863566 in words is "sixty-six billion, five hundred thirty-six million, eight hundred sixty-three thousand, five hundred sixty-six".