6559889621 has 2 divisors, whose sum is σ = 6559889622. Its totient is φ = 6559889620.

The previous prime is 6559889591. The next prime is 6559889657. The reversal of 6559889621 is 1269889556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5470229521 + 1089660100 = 73961^2 + 33010^2 .

It is a cyclic number.

It is not a de Polignac number, because 6559889621 - 2²² = 6555695317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559885621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279944810 + 3279944811.

It is an arithmetic number, because the mean of its divisors is an integer number (3279944811).

Almost surely, 2^6559889621 is an apocalyptic number.

It is an amenable number.

6559889621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559889621 is an equidigital number, since it uses as much as digits as its factorization.

6559889621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 59.

The square root of 6559889621 is about 80993.1455186178. The cubic root of 6559889621 is about 1871.9698252138.

The spelling of 6559889621 in words is "six billion, five hundred fifty-nine million, eight hundred eighty-nine thousand, six hundred twenty-one".