84128266589 has 2 divisors, whose sum is σ = 84128266590. Its totient is φ = 84128266588.

The previous prime is 84128266577. The next prime is 84128266591. The reversal of 84128266589 is 98566282148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61588348900 + 22539917689 = 248170^2 + 150133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84128266589 is a prime.

Together with 84128266591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84128263589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42064133294 + 42064133295.

It is an arithmetic number, because the mean of its divisors is an integer number (42064133295).

Almost surely, 2^84128266589 is an apocalyptic number.

It is an amenable number.

84128266589 is a deficient number, since it is larger than the sum of its proper divisors (1).

84128266589 is an equidigital number, since it uses as much as digits as its factorization.

84128266589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13271040, while the sum is 59.

The spelling of 84128266589 in words is "eighty-four billion, one hundred twenty-eight million, two hundred sixty-six thousand, five hundred eighty-nine".