165636325 has 6 divisors (see below), whose sum is σ = 205389074. Its totient is φ = 132509040.

The previous prime is 165636311. The next prime is 165636329. The reversal of 165636325 is 523636561.

It can be written as a sum of positive squares in 3 ways, for example, as 11826721 + 153809604 = 3439^2 + 12402^2 .

It is not a de Polignac number, because 165636325 - 2¹⁹ = 165112037 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165636329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3312702 + ... + 3312751.

Almost surely, 2^165636325 is an apocalyptic number.

It is an amenable number.

165636325 is a deficient number, since it is larger than the sum of its proper divisors (39752749).

165636325 is an equidigital number, since it uses as much as digits as its factorization.

165636325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6625463 (or 6625458 counting only the distinct ones).

The product of its digits is 97200, while the sum is 37.

The square root of 165636325 is about 12869.9776612083. The cubic root of 165636325 is about 549.1848254556.

The spelling of 165636325 in words is "one hundred sixty-five million, six hundred thirty-six thousand, three hundred twenty-five".