66851944 has 16 divisors (see below), whose sum is σ = 126565920. Its totient is φ = 33101040.

The previous prime is 66851929. The next prime is 66851947. The reversal of 66851944 is 44915866.

66851944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66851944.

It is not an unprimeable number, because it can be changed into a prime (66851947) by changing a digit.

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, 39742 + ... + 41389.

It is an arithmetic number, because the mean of its divisors is an integer number (7910370).

Almost surely, 2^66851944 is an apocalyptic number.

It is an amenable number.

66851944 is a deficient number, since it is larger than the sum of its proper divisors (59713976).

66851944 is a wasteful number, since it uses less digits than its factorization.

66851944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81240 (or 81236 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 66851944 is about 8176.3038104024. The cubic root of 66851944 is about 405.8554169834.

The spelling of 66851944 in words is "sixty-six million, eight hundred fifty-one thousand, nine hundred forty-four".