165605106 has 32 divisors (see below), whose sum is σ = 350788608. Its totient is φ = 52010640.

The previous prime is 165605101. The next prime is 165605123. The reversal of 165605106 is 601506561.

It is a super-2 number, since 2×165605106² = 54850102266542472, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165605101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291 + ... + 18201.

It is an arithmetic number, because the mean of its divisors is an integer number (10962144).

Almost surely, 2^165605106 is an apocalyptic number.

165605106 is an abundant number, since it is smaller than the sum of its proper divisors (185183502).

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

165605106 is a wasteful number, since it uses less digits than its factorization.

165605106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18006.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 165605106 is about 12868.7647425850. The cubic root of 165605106 is about 549.1503199844.

The spelling of 165605106 in words is "one hundred sixty-five million, six hundred five thousand, one hundred six".