66591306 has 12 divisors (see below), whose sum is σ = 144281202. Its totient is φ = 22197096.

The previous prime is 66591299. The next prime is 66591311. The reversal of 66591306 is 60319566.

66591306 is a `hidden beast` number, since 66 + 591 + 3 + 0 + 6 = 666.

66591306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 49575681 + 17015625 = 7041^2 + 4125^2 .

It is a Curzon number.

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 5 ways as a sum of consecutive naturals, for example, 1849741 + ... + 1849776.

Almost surely, 2^66591306 is an apocalyptic number.

66591306 is an abundant number, since it is smaller than the sum of its proper divisors (77689896).

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

66591306 is a wasteful number, since it uses less digits than its factorization.

66591306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699525 (or 3699522 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 66591306 is about 8160.3496248629. The cubic root of 66591306 is about 405.3272891659.

The spelling of 66591306 in words is "sixty-six million, five hundred ninety-one thousand, three hundred six".