168397543871 has 2 divisors, whose sum is σ = 168397543872. Its totient is φ = 168397543870.

The previous prime is 168397543861. The next prime is 168397543901. The reversal of 168397543871 is 178345793861.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (178345793861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168397543871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168397543801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84198771935 + 84198771936.

It is an arithmetic number, because the mean of its divisors is an integer number (84198771936).

Almost surely, 2^168397543871 is an apocalyptic number.

168397543871 is a deficient number, since it is larger than the sum of its proper divisors (1).

168397543871 is an equidigital number, since it uses as much as digits as its factorization.

168397543871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 62.

The spelling of 168397543871 in words is "one hundred sixty-eight billion, three hundred ninety-seven million, five hundred forty-three thousand, eight hundred seventy-one".