163185565 has 4 divisors (see below), whose sum is σ = 195822684. Its totient is φ = 130548448.

The previous prime is 163185557. The next prime is 163185571. The reversal of 163185565 is 565581361.

163185565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 25381444 + 137804121 = 5038^2 + 11739^2 .

It is a cyclic number.

It is not a de Polignac number, because 163185565 - 2³ = 163185557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16318552 + ... + 16318561.

It is an arithmetic number, because the mean of its divisors is an integer number (48955671).

Almost surely, 2^163185565 is an apocalyptic number.

It is an amenable number.

163185565 is a deficient number, since it is larger than the sum of its proper divisors (32637119).

163185565 is an equidigital number, since it uses as much as digits as its factorization.

163185565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32637118.

The product of its digits is 108000, while the sum is 40.

The square root of 163185565 is about 12774.4105539160. The cubic root of 163185565 is about 546.4627707694.

The spelling of 163185565 in words is "one hundred sixty-three million, one hundred eighty-five thousand, five hundred sixty-five".