66564886652 has 24 divisors (see below), whose sum is σ = 127438445232. Its totient is φ = 30171046400.

The previous prime is 66564886631. The next prime is 66564886693. The reversal of 66564886652 is 25668846566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127299 + ... + 2158362.

It is an arithmetic number, because the mean of its divisors is an integer number (5309935218).

Almost surely, 2^66564886652 is an apocalyptic number.

It is an amenable number.

66564886652 is a deficient number, since it is larger than the sum of its proper divisors (60873558580).

66564886652 is a wasteful number, since it uses less digits than its factorization.

66564886652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286029 (or 4286027 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 62.

The spelling of 66564886652 in words is "sixty-six billion, five hundred sixty-four million, eight hundred eighty-six thousand, six hundred fifty-two".