66009085684 has 12 divisors (see below), whose sum is σ = 116114429284. Its totient is φ = 32833534464.

The previous prime is 66009085673. The next prime is 66009085721. The reversal of 66009085684 is 48658090066.

It can be written as a sum of positive squares in 2 ways, for example, as 5899776100 + 60109309584 = 76810^2 + 245172^2 .

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 3 ways as a sum of consecutive naturals, for example, 42751227 + ... + 42752770.

Almost surely, 2^66009085684 is an apocalyptic number.

It is an amenable number.

66009085684 is a deficient number, since it is larger than the sum of its proper divisors (50105343600).

66009085684 is a wasteful number, since it uses less digits than its factorization.

66009085684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85504194 (or 85504192 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 66009085684 in words is "sixty-six billion, nine million, eighty-five thousand, six hundred eighty-four".