165606165 has 48 divisors (see below), whose sum is σ = 294053760. Its totient is φ = 86198400.

The previous prime is 165606157. The next prime is 165606167. The reversal of 165606165 is 561606561.

It is not a de Polignac number, because 165606165 - 2³ = 165606157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165606167) 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 47 ways as a sum of consecutive naturals, for example, 377016 + ... + 377454.

It is an arithmetic number, because the mean of its divisors is an integer number (6126120).

Almost surely, 2^165606165 is an apocalyptic number.

165606165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165606165 is a deficient number, since it is larger than the sum of its proper divisors (128447595).

165606165 is a wasteful number, since it uses less digits than its factorization.

165606165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 165606165 is about 12868.8058886596. The cubic root of 165606165 is about 549.1514905380.

The spelling of 165606165 in words is "one hundred sixty-five million, six hundred six thousand, one hundred sixty-five".