66631944 has 32 divisors (see below), whose sum is σ = 166813920. Its totient is φ = 22179456.

The previous prime is 66631933. The next prime is 66631963. The reversal of 66631944 is 44913666.

66631944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66631944² = 8879631922438272, which contains 22 as substring.

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, 21007 + ... + 23969.

It is an arithmetic number, because the mean of its divisors is an integer number (5212935).

Almost surely, 2^66631944 is an apocalyptic number.

It is an amenable number.

66631944 is an abundant number, since it is smaller than the sum of its proper divisors (100181976).

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

66631944 is a wasteful number, since it uses less digits than its factorization.

66631944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909 (or 3905 counting only the distinct ones).

The product of its digits is 93312, while the sum is 39.

The square root of 66631944 is about 8162.8392119409. The cubic root of 66631944 is about 405.4097240554.

The spelling of 66631944 in words is "sixty-six million, six hundred thirty-one thousand, nine hundred forty-four".