167717861787871 has 2 divisors, whose sum is σ = 167717861787872. Its totient is φ = 167717861787870.

The previous prime is 167717861787859. The next prime is 167717861787913. The reversal of 167717861787871 is 178787168717761.

167717861787871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (178787168717761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 167717861787871 - 2¹¹ = 167717861785823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167717867787871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83858930893935 + 83858930893936.

It is an arithmetic number, because the mean of its divisors is an integer number (83858930893936).

Almost surely, 2^{167717861787871} is an apocalyptic number.

167717861787871 is a deficient number, since it is larger than the sum of its proper divisors (1).

167717861787871 is an equidigital number, since it uses as much as digits as its factorization.

167717861787871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2168506368, while the sum is 82.

The spelling of 167717861787871 in words is "one hundred sixty-seven trillion, seven hundred seventeen billion, eight hundred sixty-one million, seven hundred eighty-seven thousand, eight hundred seventy-one".