6556559 has 2 divisors, whose sum is σ = 6556560. Its totient is φ = 6556558.

The previous prime is 6556519. The next prime is 6556567. The reversal of 6556559 is 9556556.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6556559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6556519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278279 + 3278280.

It is an arithmetic number, because the mean of its divisors is an integer number (3278280).

Almost surely, 2^6556559 is an apocalyptic number.

6556559 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556559 is an equidigital number, since it uses as much as digits as its factorization.

6556559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 202500, while the sum is 41.

The square root of 6556559 is about 2560.5778644673. The cubic root of 6556559 is about 187.1652956188.

The spelling of 6556559 in words is "six million, five hundred fifty-six thousand, five hundred fifty-nine".