168500857309 has 2 divisors, whose sum is σ = 168500857310. Its totient is φ = 168500857308.

The previous prime is 168500857307. The next prime is 168500857351. The reversal of 168500857309 is 903758005861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97596884025 + 70903973284 = 312405^2 + 266278^2 .

It is an emirp because it is prime and its reverse (903758005861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168500857309 - 2¹ = 168500857307 is a prime.

Together with 168500857307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168500857307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84250428654 + 84250428655.

It is an arithmetic number, because the mean of its divisors is an integer number (84250428655).

Almost surely, 2^168500857309 is an apocalyptic number.

It is an amenable number.

168500857309 is a deficient number, since it is larger than the sum of its proper divisors (1).

168500857309 is an equidigital number, since it uses as much as digits as its factorization.

168500857309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 168500857309 in words is "one hundred sixty-eight billion, five hundred million, eight hundred fifty-seven thousand, three hundred nine".