6559663 has 8 divisors (see below), whose sum is σ = 7174656. Its totient is φ = 5947800.

The previous prime is 6559661. The next prime is 6559667. The reversal of 6559663 is 3669556.

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 6559663 - 2¹ = 6559661 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 (6559661) by changing a digit.

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, 7170 + ... + 8032.

It is an arithmetic number, because the mean of its divisors is an integer number (896832).

Almost surely, 2^6559663 is an apocalyptic number.

6559663 is a deficient number, since it is larger than the sum of its proper divisors (614993).

6559663 is a wasteful number, since it uses less digits than its factorization.

6559663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its digits is 145800, while the sum is 40.

The square root of 6559663 is about 2561.1839059310. The cubic root of 6559663 is about 187.1948268319.

The spelling of 6559663 in words is "six million, five hundred fifty-nine thousand, six hundred sixty-three".