165613365 has 24 divisors (see below), whose sum is σ = 289612440. Its totient is φ = 87542784.

The previous prime is 165613361. The next prime is 165613373. The reversal of 165613365 is 563316561.

165613365 is a `hidden beast` number, since 1 + 6 + 5 + 613 + 36 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16016004 + 149597361 = 4002^2 + 12231^2 .

It is not a de Polignac number, because 165613365 - 2² = 165613361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165613361) 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 23 ways as a sum of consecutive naturals, for example, 11200 + ... + 21369.

It is an arithmetic number, because the mean of its divisors is an integer number (12067185).

Almost surely, 2^165613365 is an apocalyptic number.

165613365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165613365 is a deficient number, since it is larger than the sum of its proper divisors (123999075).

165613365 is a wasteful number, since it uses less digits than its factorization.

165613365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32693 (or 32690 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 165613365 is about 12869.0856318543. The cubic root of 165613365 is about 549.1594488436.

The spelling of 165613365 in words is "one hundred sixty-five million, six hundred thirteen thousand, three hundred sixty-five".