6663679 has 4 divisors (see below), whose sum is σ = 7269480. Its totient is φ = 6057880.

The previous prime is 6663673. The next prime is 6663731. The reversal of 6663679 is 9763666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6663679 - 2⁵ = 6663647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663673) 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 3 ways as a sum of consecutive naturals, for example, 302884 + ... + 302905.

It is an arithmetic number, because the mean of its divisors is an integer number (1817370).

Almost surely, 2^6663679 is an apocalyptic number.

6663679 is a deficient number, since it is larger than the sum of its proper divisors (605801).

6663679 is a wasteful number, since it uses less digits than its factorization.

6663679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605800.

The product of its digits is 244944, while the sum is 43.

The square root of 6663679 is about 2581.4102734746. The cubic root of 6663679 is about 188.1790865555.

The spelling of 6663679 in words is "six million, six hundred sixty-three thousand, six hundred seventy-nine".