66689044 has 12 divisors (see below), whose sum is σ = 119420224. Its totient is φ = 32568984.

The previous prime is 66689041. The next prime is 66689071. The reversal of 66689044 is 44098666.

66689044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689041) 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, 193692 + ... + 194035.

Almost surely, 2^66689044 is an apocalyptic number.

It is an amenable number.

66689044 is a deficient number, since it is larger than the sum of its proper divisors (52731180).

66689044 is a wasteful number, since it uses less digits than its factorization.

66689044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387774 (or 387772 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 66689044 is about 8166.3360205174. The cubic root of 66689044 is about 405.5254957836.

The spelling of 66689044 in words is "sixty-six million, six hundred eighty-nine thousand, forty-four".