168215165 has 4 divisors (see below), whose sum is σ = 201858204. Its totient is φ = 134572128.

The previous prime is 168215149. The next prime is 168215219. The reversal of 168215165 is 561512861.

It is a happy number.

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 125037124 + 43178041 = 11182^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 168215165 - 2⁴ = 168215149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16821512 + ... + 16821521.

It is an arithmetic number, because the mean of its divisors is an integer number (50464551).

Almost surely, 2^168215165 is an apocalyptic number.

It is an amenable number.

168215165 is a deficient number, since it is larger than the sum of its proper divisors (33643039).

168215165 is an equidigital number, since it uses as much as digits as its factorization.

168215165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33643038.

The product of its digits is 14400, while the sum is 35.

The square root of 168215165 is about 12969.7789109915. The cubic root of 168215165 is about 552.0202998293.

The spelling of 168215165 in words is "one hundred sixty-eight million, two hundred fifteen thousand, one hundred sixty-five".