66423856 has 20 divisors (see below), whose sum is σ = 128835504. Its totient is φ = 33176000.

The previous prime is 66423827. The next prime is 66423871. The reversal of 66423856 is 65832466.

It is a happy number.

66423856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19221 + ... + 22411.

Almost surely, 2^66423856 is an apocalyptic number.

It is an amenable number.

66423856 is a deficient number, since it is larger than the sum of its proper divisors (62411648).

66423856 is a wasteful number, since it uses less digits than its factorization.

66423856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500 (or 4494 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 66423856 is about 8150.0831897595. The cubic root of 66423856 is about 404.9872596714.

The spelling of 66423856 in words is "sixty-six million, four hundred twenty-three thousand, eight hundred fifty-six".