168375809 has 6 divisors (see below), whose sum is σ = 195865794. Its totient is φ = 144322080.

The previous prime is 168375797. The next prime is 168375821. The reversal of 168375809 is 908573861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (168375797) and next prime (168375821).

It can be written as a sum of positive squares in only one way, i.e., 109516225 + 58859584 = 10465^2 + 7672^2 .

It is not a de Polignac number, because 168375809 - 2¹⁶ = 168310273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168375509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1718072 + ... + 1718169.

It is an arithmetic number, because the mean of its divisors is an integer number (32644299).

Almost surely, 2^168375809 is an apocalyptic number.

It is an amenable number.

168375809 is a deficient number, since it is larger than the sum of its proper divisors (27489985).

168375809 is an equidigital number, since it uses as much as digits as its factorization.

168375809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436255 (or 3436248 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 168375809 is about 12975.9704454041. The cubic root of 168375809 is about 552.1959687608.

The spelling of 168375809 in words is "one hundred sixty-eight million, three hundred seventy-five thousand, eight hundred nine".