168321137923 has 2 divisors, whose sum is σ = 168321137924. Its totient is φ = 168321137922.

The previous prime is 168321137909. The next prime is 168321137947. The reversal of 168321137923 is 329731123861.

It is a weak prime.

It is an emirp because it is prime and its reverse (329731123861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168321137923 - 2²⁵ = 168287583491 is a prime.

It is not a weakly prime, because it can be changed into another prime (168321137903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84160568961 + 84160568962.

It is an arithmetic number, because the mean of its divisors is an integer number (84160568962).

Almost surely, 2^168321137923 is an apocalyptic number.

168321137923 is a deficient number, since it is larger than the sum of its proper divisors (1).

168321137923 is an equidigital number, since it uses as much as digits as its factorization.

168321137923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The spelling of 168321137923 in words is "one hundred sixty-eight billion, three hundred twenty-one million, one hundred thirty-seven thousand, nine hundred twenty-three".