168394573889 has 8 divisors (see below), whose sum is σ = 172728468360. Its totient is φ = 164071475200.

The previous prime is 168394573861. The next prime is 168394573901. The reversal of 168394573889 is 988375493861.

It can be written as a sum of positive squares in 4 ways, for example, as 81306289 + 168313267600 = 9017^2 + 410260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168394573889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168394573859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2667344 + ... + 2729745.

It is an arithmetic number, because the mean of its divisors is an integer number (21591058545).

Almost surely, 2^168394573889 is an apocalyptic number.

It is an amenable number.

168394573889 is a deficient number, since it is larger than the sum of its proper divisors (4333894471).

168394573889 is an equidigital number, since it uses as much as digits as its factorization.

168394573889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397891.

The product of its digits is 313528320, while the sum is 71.

The spelling of 168394573889 in words is "one hundred sixty-eight billion, three hundred ninety-four million, five hundred seventy-three thousand, eight hundred eighty-nine".