6656559 has 32 divisors (see below), whose sum is σ = 11235840. Its totient is φ = 3411072.

The previous prime is 6656549. The next prime is 6656561. The reversal of 6656559 is 9556566.

It is not a de Polignac number, because 6656559 - 2⁴ = 6656543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6656559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9772 + ... + 10430.

It is an arithmetic number, because the mean of its divisors is an integer number (351120).

Almost surely, 2^6656559 is an apocalyptic number.

6656559 is a deficient number, since it is larger than the sum of its proper divisors (4579281).

6656559 is a wasteful number, since it uses less digits than its factorization.

6656559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719.

The product of its digits is 243000, while the sum is 42.

The square root of 6656559 is about 2580.0308137695. The cubic root of 6656559 is about 188.1120408802.

The spelling of 6656559 in words is "six million, six hundred fifty-six thousand, five hundred fifty-nine".