165523005 has 12 divisors (see below), whose sum is σ = 286906620. Its totient is φ = 88278912.

The previous prime is 165522997. The next prime is 165523051. The reversal of 165523005 is 500325561.

165523005 is a `hidden beast` number, since 1 + 655 + 2 + 3 + 0 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30173049 + 135349956 = 5493^2 + 11634^2 .

It is not a de Polignac number, because 165523005 - 2³ = 165522997 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165523005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1839100 + ... + 1839189.

It is an arithmetic number, because the mean of its divisors is an integer number (23908885).

Almost surely, 2^165523005 is an apocalyptic number.

165523005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165523005 is a deficient number, since it is larger than the sum of its proper divisors (121383615).

165523005 is a wasteful number, since it uses less digits than its factorization.

165523005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678300 (or 3678297 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 165523005 is about 12865.5744139156. The cubic root of 165523005 is about 549.0595553854.

Adding to 165523005 its reverse (500325561), we get a palindrome (665848566).

The spelling of 165523005 in words is "one hundred sixty-five million, five hundred twenty-three thousand, five".