172686085589 has 2 divisors, whose sum is σ = 172686085590. Its totient is φ = 172686085588.

The previous prime is 172686085577. The next prime is 172686085673. The reversal of 172686085589 is 985580686271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138402600625 + 34283484964 = 372025^2 + 185158^2 .

It is a cyclic number.

It is not a de Polignac number, because 172686085589 - 2⁸ = 172686085333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172686085549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86343042794 + 86343042795.

It is an arithmetic number, because the mean of its divisors is an integer number (86343042795).

Almost surely, 2^172686085589 is an apocalyptic number.

It is an amenable number.

172686085589 is a deficient number, since it is larger than the sum of its proper divisors (1).

172686085589 is an equidigital number, since it uses as much as digits as its factorization.

172686085589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58060800, while the sum is 65.

The spelling of 172686085589 in words is "one hundred seventy-two billion, six hundred eighty-six million, eighty-five thousand, five hundred eighty-nine".