171685216867 has 2 divisors, whose sum is σ = 171685216868. Its totient is φ = 171685216866.

The previous prime is 171685216849. The next prime is 171685216891. The reversal of 171685216867 is 768612586171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171685216867 - 2¹¹ = 171685214819 is a prime.

It is not a weakly prime, because it can be changed into another prime (171685217867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85842608433 + 85842608434.

It is an arithmetic number, because the mean of its divisors is an integer number (85842608434).

Almost surely, 2^171685216867 is an apocalyptic number.

171685216867 is a deficient number, since it is larger than the sum of its proper divisors (1).

171685216867 is an equidigital number, since it uses as much as digits as its factorization.

171685216867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The spelling of 171685216867 in words is "one hundred seventy-one billion, six hundred eighty-five million, two hundred sixteen thousand, eight hundred sixty-seven".