66564247924 has 12 divisors (see below), whose sum is σ = 120245093248. Its totient is φ = 32208507000.

The previous prime is 66564247921. The next prime is 66564247969. The reversal of 66564247924 is 42974246566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564247921) 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, 268404102 + ... + 268404349.

Almost surely, 2^66564247924 is an apocalyptic number.

It is an amenable number.

66564247924 is a deficient number, since it is larger than the sum of its proper divisors (53680845324).

66564247924 is a wasteful number, since it uses less digits than its factorization.

66564247924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536808486 (or 536808484 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 55.

The spelling of 66564247924 in words is "sixty-six billion, five hundred sixty-four million, two hundred forty-seven thousand, nine hundred twenty-four".