6659985 has 8 divisors (see below), whose sum is σ = 10656000. Its totient is φ = 3551984.

The previous prime is 6659977. The next prime is 6660011. The reversal of 6659985 is 5899566.

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 6659985 - 2³ = 6659977 is a prime.

6659985 is a lucky number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 221985 + ... + 222014.

It is an arithmetic number, because the mean of its divisors is an integer number (1332000).

Almost surely, 2^6659985 is an apocalyptic number.

It is an amenable number.

6659985 is a deficient number, since it is larger than the sum of its proper divisors (3996015).

6659985 is a wasteful number, since it uses less digits than its factorization.

6659985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444007.

The product of its digits is 583200, while the sum is 48.

The square root of 6659985 is about 2580.6946739202. The cubic root of 6659985 is about 188.1443078677.

The spelling of 6659985 in words is "six million, six hundred fifty-nine thousand, nine hundred eighty-five".