86171365661 has 2 divisors, whose sum is σ = 86171365662. Its totient is φ = 86171365660.

The previous prime is 86171365613. The next prime is 86171365717. The reversal of 86171365661 is 16656317168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52289968900 + 33881396761 = 228670^2 + 184069^2 .

It is a cyclic number.

It is not a de Polignac number, because 86171365661 - 2¹⁸ = 86171103517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86171365061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43085682830 + 43085682831.

It is an arithmetic number, because the mean of its divisors is an integer number (43085682831).

Almost surely, 2^86171365661 is an apocalyptic number.

It is an amenable number.

86171365661 is a deficient number, since it is larger than the sum of its proper divisors (1).

86171365661 is an equidigital number, since it uses as much as digits as its factorization.

86171365661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The spelling of 86171365661 in words is "eighty-six billion, one hundred seventy-one million, three hundred sixty-five thousand, six hundred sixty-one".