6663986 has 16 divisors (see below), whose sum is σ = 11463936. Its totient is φ = 2846016.

The previous prime is 6663971. The next prime is 6664019. The reversal of 6663986 is 6893666.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 4490 + ... + 5786.

It is an arithmetic number, because the mean of its divisors is an integer number (716496).

Almost surely, 2^6663986 is an apocalyptic number.

6663986 is a deficient number, since it is larger than the sum of its proper divisors (4799950).

6663986 is a wasteful number, since it uses less digits than its factorization.

6663986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its digits is 279936, while the sum is 44.

The square root of 6663986 is about 2581.4697364099. The cubic root of 6663986 is about 188.1819763552.

The spelling of 6663986 in words is "six million, six hundred sixty-three thousand, nine hundred eighty-six".