165505660 has 12 divisors (see below), whose sum is σ = 347561928. Its totient is φ = 66202256.

The previous prime is 165505651. The next prime is 165505661. The reversal of 165505660 is 66505561.

165505660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165505661) 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 3 ways as a sum of consecutive naturals, for example, 4137622 + ... + 4137661.

It is an arithmetic number, because the mean of its divisors is an integer number (28963494).

Almost surely, 2^165505660 is an apocalyptic number.

165505660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165505660 is an abundant number, since it is smaller than the sum of its proper divisors (182056268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165505660 is a wasteful number, since it uses less digits than its factorization.

165505660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8275292 (or 8275290 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 165505660 is about 12864.9003105349. The cubic root of 165505660 is about 549.0403762373.

Subtracting from 165505660 its reverse (66505561), we obtain a palindrome (99000099).

The spelling of 165505660 in words is "one hundred sixty-five million, five hundred five thousand, six hundred sixty".