859166589661 has 2 divisors, whose sum is σ = 859166589662. Its totient is φ = 859166589660.

The previous prime is 859166589607. The next prime is 859166589679. The reversal of 859166589661 is 166985661958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662213475225 + 196953114436 = 813765^2 + 443794^2 .

It is a cyclic number.

It is not a de Polignac number, because 859166589661 - 2³³ = 850576655069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859166589761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429583294830 + 429583294831.

It is an arithmetic number, because the mean of its divisors is an integer number (429583294831).

Almost surely, 2^859166589661 is an apocalyptic number.

It is an amenable number.

859166589661 is a deficient number, since it is larger than the sum of its proper divisors (1).

859166589661 is an equidigital number, since it uses as much as digits as its factorization.

859166589661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 167961600, while the sum is 70.

The spelling of 859166589661 in words is "eight hundred fifty-nine billion, one hundred sixty-six million, five hundred eighty-nine thousand, six hundred sixty-one".