66328585 has 8 divisors (see below), whose sum is σ = 80489160. Its totient is φ = 52466304.

The previous prime is 66328579. The next prime is 66328589. The reversal of 66328585 is 58582366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85264 + 66243321 = 292^2 + 8139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66328585 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66328589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74082 + ... + 74971.

It is an arithmetic number, because the mean of its divisors is an integer number (10061145).

Almost surely, 2^66328585 is an apocalyptic number.

It is an amenable number.

66328585 is a deficient number, since it is larger than the sum of its proper divisors (14160575).

66328585 is a wasteful number, since it uses less digits than its factorization.

66328585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149147.

The product of its digits is 345600, while the sum is 43.

The square root of 66328585 is about 8144.2363055108. The cubic root of 66328585 is about 404.7935441154.

The spelling of 66328585 in words is "sixty-six million, three hundred twenty-eight thousand, five hundred eighty-five".