165216325 has 6 divisors (see below), whose sum is σ = 204868274. Its totient is φ = 132173040.

The previous prime is 165216287. The next prime is 165216349. The reversal of 165216325 is 523612561.

It can be written as a sum of positive squares in 3 ways, for example, as 3265249 + 161951076 = 1807^2 + 12726^2 .

It is not a de Polignac number, because 165216325 - 2¹¹ = 165214277 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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3304302 + ... + 3304351.

Almost surely, 2^165216325 is an apocalyptic number.

It is an amenable number.

165216325 is a deficient number, since it is larger than the sum of its proper divisors (39651949).

165216325 is an equidigital number, since it uses as much as digits as its factorization.

165216325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6608663 (or 6608658 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 165216325 is about 12853.6502597511. The cubic root of 165216325 is about 548.7202476938.

Adding to 165216325 its reverse (523612561), we get a palindrome (688828886).

The spelling of 165216325 in words is "one hundred sixty-five million, two hundred sixteen thousand, three hundred twenty-five".