66884418684 has 60 divisors (see below), whose sum is σ = 176022693000. Its totient is φ = 22145160672.

The previous prime is 66884418617. The next prime is 66884418719. The reversal of 66884418684 is 48681448866.

66884418684 is a `hidden beast` number, since 6 + 68 + 84 + 418 + 6 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 644454 + ... + 741005.

It is an arithmetic number, because the mean of its divisors is an integer number (2933711550).

Almost surely, 2^66884418684 is an apocalyptic number.

It is an amenable number.

66884418684 is an abundant number, since it is smaller than the sum of its proper divisors (109138274316).

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

66884418684 is a wasteful number, since it uses less digits than its factorization.

66884418684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385624 (or 1385613 counting only the distinct ones).

The product of its digits is 56623104, while the sum is 63.

The spelling of 66884418684 in words is "sixty-six billion, eight hundred eighty-four million, four hundred eighteen thousand, six hundred eighty-four".