168159889 has 4 divisors (see below), whose sum is σ = 168188724. Its totient is φ = 168131056.

The previous prime is 168159881. The next prime is 168159917. The reversal of 168159889 is 988951861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70308225 + 97851664 = 8385^2 + 9892^2 .

It is a cyclic number.

It is not a de Polignac number, because 168159889 - 2³ = 168159881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168159881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2242 + ... + 18475.

It is an arithmetic number, because the mean of its divisors is an integer number (42047181).

It is a 5832-hyperperfect number.

Almost surely, 2^168159889 is an apocalyptic number.

It is an amenable number.

168159889 is a deficient number, since it is larger than the sum of its proper divisors (28835).

168159889 is an equidigital number, since it uses as much as digits as its factorization.

168159889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28834.

The product of its digits is 1244160, while the sum is 55.

The square root of 168159889 is about 12967.6477820767. The cubic root of 168159889 is about 551.9598280382.

The spelling of 168159889 in words is "one hundred sixty-eight million, one hundred fifty-nine thousand, eight hundred eighty-nine".