171684865117 has 2 divisors, whose sum is σ = 171684865118. Its totient is φ = 171684865116.

The previous prime is 171684865067. The next prime is 171684865123. The reversal of 171684865117 is 711568486171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151522569081 + 20162296036 = 389259^2 + 141994^2 .

It is a cyclic number.

It is not a de Polignac number, because 171684865117 - 2²³ = 171676476509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171684860117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85842432558 + 85842432559.

It is an arithmetic number, because the mean of its divisors is an integer number (85842432559).

Almost surely, 2^171684865117 is an apocalyptic number.

It is an amenable number.

171684865117 is a deficient number, since it is larger than the sum of its proper divisors (1).

171684865117 is an equidigital number, since it uses as much as digits as its factorization.

171684865117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 55.

The spelling of 171684865117 in words is "one hundred seventy-one billion, six hundred eighty-four million, eight hundred sixty-five thousand, one hundred seventeen".