6559661 has 2 divisors, whose sum is σ = 6559662. Its totient is φ = 6559660.

The previous prime is 6559643. The next prime is 6559667. The reversal of 6559661 is 1669556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 630436 = 2435^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 6559661 - 2¹⁸ = 6297517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279830 + 3279831.

It is an arithmetic number, because the mean of its divisors is an integer number (3279831).

Almost surely, 2^6559661 is an apocalyptic number.

It is an amenable number.

6559661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559661 is an equidigital number, since it uses as much as digits as its factorization.

6559661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 38.

The square root of 6559661 is about 2561.1835154865. The cubic root of 6559661 is about 187.1948078070.

The spelling of 6559661 in words is "six million, five hundred fifty-nine thousand, six hundred sixty-one".