669684585 has 16 divisors (see below), whose sum is σ = 1072422144. Its totient is φ = 356856192.

The previous prime is 669684577. The next prime is 669684593. The reversal of 669684585 is 585486966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (669684577) and next prime (669684593).

It is not a de Polignac number, because 669684585 - 2³ = 669684577 is a prime.

It is an unprimeable number.

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, 817 + ... + 36606.

It is an arithmetic number, because the mean of its divisors is an integer number (67026384).

Almost surely, 2^669684585 is an apocalyptic number.

It is an amenable number.

669684585 is a deficient number, since it is larger than the sum of its proper divisors (402737559).

669684585 is a wasteful number, since it uses less digits than its factorization.

669684585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38624.

The product of its digits is 12441600, while the sum is 57.

The square root of 669684585 is about 25878.2647215767. The cubic root of 669684585 is about 874.8966778680.

The spelling of 669684585 in words is "six hundred sixty-nine million, six hundred eighty-four thousand, five hundred eighty-five".