66589344664 has 16 divisors (see below), whose sum is σ = 125019099720. Its totient is φ = 33250918080.

The previous prime is 66589344643. The next prime is 66589344667. The reversal of 66589344664 is 46644398566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66589344667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5462814 + ... + 5474989.

Almost surely, 2^66589344664 is an apocalyptic number.

It is an amenable number.

66589344664 is a deficient number, since it is larger than the sum of its proper divisors (58429755056).

66589344664 is a wasteful number, since it uses less digits than its factorization.

66589344664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10938570 (or 10938566 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 61.

The spelling of 66589344664 in words is "sixty-six billion, five hundred eighty-nine million, three hundred forty-four thousand, six hundred sixty-four".