66143856 has 40 divisors (see below), whose sum is σ = 173044480. Its totient is φ = 21767616.

The previous prime is 66143843. The next prime is 66143881. The reversal of 66143856 is 65834166.

66143856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4930 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (4326112).

Almost surely, 2^66143856 is an apocalyptic number.

It is an amenable number.

66143856 is an abundant number, since it is smaller than the sum of its proper divisors (106900624).

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

66143856 is a wasteful number, since it uses less digits than its factorization.

66143856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17533 (or 17527 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 66143856 is about 8132.8873101747. The cubic root of 66143856 is about 404.4174034527.

The spelling of 66143856 in words is "sixty-six million, one hundred forty-three thousand, eight hundred fifty-six".