666563585 has 8 divisors (see below), whose sum is σ = 801285480. Its totient is φ = 532311424.

The previous prime is 666563537. The next prime is 666563587. The reversal of 666563585 is 585365666.

666563585 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 4 ways, for example, as 1129969 + 665433616 = 1063^2 + 25796^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 666563585 - 2⁸ = 666563329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666563587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114302 + ... + 119991.

It is an arithmetic number, because the mean of its divisors is an integer number (100160685).

Almost surely, 2^666563585 is an apocalyptic number.

It is an amenable number.

666563585 is a deficient number, since it is larger than the sum of its proper divisors (134721895).

666563585 is a wasteful number, since it uses less digits than its factorization.

666563585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234867.

The product of its digits is 3888000, while the sum is 50.

The square root of 666563585 is about 25817.8927296555. The cubic root of 666563585 is about 873.5354373503.

The spelling of 666563585 in words is "six hundred sixty-six million, five hundred sixty-three thousand, five hundred eighty-five".