6559856789 has 2 divisors, whose sum is σ = 6559856790. Its totient is φ = 6559856788.

The previous prime is 6559856783. The next prime is 6559856839. The reversal of 6559856789 is 9876589556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4811780689 + 1748076100 = 69367^2 + 41810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6559856789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559856783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279928394 + 3279928395.

It is an arithmetic number, because the mean of its divisors is an integer number (3279928395).

Almost surely, 2^6559856789 is an apocalyptic number.

It is an amenable number.

6559856789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559856789 is an equidigital number, since it uses as much as digits as its factorization.

6559856789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296000, while the sum is 68.

The square root of 6559856789 is about 80992.9428345458. The cubic root of 6559856789 is about 1871.9667021625.

The spelling of 6559856789 in words is "six billion, five hundred fifty-nine million, eight hundred fifty-six thousand, seven hundred eighty-nine".