66564227646 has 24 divisors (see below), whose sum is σ = 164825706864. Its totient is φ = 19018350720.

The previous prime is 66564227591. The next prime is 66564227669. The reversal of 66564227646 is 64672246566.

66564227646 is a `hidden beast` number, since 6 + 6 + 564 + 2 + 2 + 76 + 4 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66564227592 and 66564227601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264143635 + ... + 264143886.

It is an arithmetic number, because the mean of its divisors is an integer number (6867737786).

Almost surely, 2^66564227646 is an apocalyptic number.

66564227646 is an abundant number, since it is smaller than the sum of its proper divisors (98261479218).

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

66564227646 is a wasteful number, since it uses less digits than its factorization.

66564227646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528287536 (or 528287533 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 54.

The spelling of 66564227646 in words is "sixty-six billion, five hundred sixty-four million, two hundred twenty-seven thousand, six hundred forty-six".