66884640008 has 16 divisors (see below), whose sum is σ = 125417236560. Its totient is φ = 33440043600.

The previous prime is 66884639999. The next prime is 66884640077. The reversal of 66884640008 is 80004648866.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156278 + ... + 397733.

It is an arithmetic number, because the mean of its divisors is an integer number (7838577285).

Almost surely, 2^66884640008 is an apocalyptic number.

It is an amenable number.

66884640008 is a deficient number, since it is larger than the sum of its proper divisors (58532596552).

66884640008 is a wasteful number, since it uses less digits than its factorization.

66884640008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569108 (or 569104 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 66884640008 in words is "sixty-six billion, eight hundred eighty-four million, six hundred forty thousand, eight".