66143944 has 16 divisors (see below), whose sum is σ = 124225920. Its totient is φ = 33017040.

The previous prime is 66143927. The next prime is 66143953. The reversal of 66143944 is 44934166.

66143944 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, 1504 + ... + 11599.

It is an arithmetic number, because the mean of its divisors is an integer number (7764120).

Almost surely, 2^66143944 is an apocalyptic number.

It is an amenable number.

66143944 is a deficient number, since it is larger than the sum of its proper divisors (58081976).

66143944 is a wasteful number, since it uses less digits than its factorization.

66143944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13740 (or 13736 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 66143944 is about 8132.8927203056. The cubic root of 66143944 is about 404.4175828028.

The spelling of 66143944 in words is "sixty-six million, one hundred forty-three thousand, nine hundred forty-four".