66385585 has 16 divisors (see below), whose sum is σ = 93505536. Its totient is φ = 44290368.

The previous prime is 66385577. The next prime is 66385589. The reversal of 66385585 is 58558366.

It is a cyclic number.

It is not a de Polignac number, because 66385585 - 2³ = 66385577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66385589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24337 + ... + 26926.

It is an arithmetic number, because the mean of its divisors is an integer number (5844096).

Almost surely, 2^66385585 is an apocalyptic number.

It is an amenable number.

66385585 is a deficient number, since it is larger than the sum of its proper divisors (27119951).

66385585 is a wasteful number, since it uses less digits than its factorization.

66385585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51312.

The product of its digits is 864000, while the sum is 46.

The square root of 66385585 is about 8147.7349613251. The cubic root of 66385585 is about 404.9094651058.

The spelling of 66385585 in words is "sixty-six million, three hundred eighty-five thousand, five hundred eighty-five".