66531844 has 12 divisors (see below), whose sum is σ = 122558800. Its totient is φ = 31515048.

The previous prime is 66531833. The next prime is 66531911. The reversal of 66531844 is 44813566.

It is a happy number.

66531844 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, 437634 + ... + 437785.

Almost surely, 2^66531844 is an apocalyptic number.

It is an amenable number.

66531844 is a deficient number, since it is larger than the sum of its proper divisors (56026956).

66531844 is a wasteful number, since it uses less digits than its factorization.

66531844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875442 (or 875440 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 66531844 is about 8156.7054623788. The cubic root of 66531844 is about 405.2066090050.

The spelling of 66531844 in words is "sixty-six million, five hundred thirty-one thousand, eight hundred forty-four".