163709165 has 4 divisors (see below), whose sum is σ = 196451004. Its totient is φ = 130967328.

The previous prime is 163709153. The next prime is 163709179. The reversal of 163709165 is 561907361.

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 99420841 + 64288324 = 9971^2 + 8018^2 .

It is a cyclic number.

It is not a de Polignac number, because 163709165 - 2¹⁰ = 163708141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16370912 + ... + 16370921.

It is an arithmetic number, because the mean of its divisors is an integer number (49112751).

Almost surely, 2^163709165 is an apocalyptic number.

It is an amenable number.

163709165 is a deficient number, since it is larger than the sum of its proper divisors (32741839).

163709165 is an equidigital number, since it uses as much as digits as its factorization.

163709165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32741838.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 163709165 is about 12794.8882371047. Note that the first 3 decimals coincide. The cubic root of 163709165 is about 547.0466100450.

The spelling of 163709165 in words is "one hundred sixty-three million, seven hundred nine thousand, one hundred sixty-five".