165171668 has 12 divisors (see below), whose sum is σ = 289210740. Its totient is φ = 82540032.

The previous prime is 165171661. The next prime is 165171703. The reversal of 165171668 is 866171561.

It can be written as a sum of positive squares in 2 ways, for example, as 61905424 + 103266244 = 7868^2 + 10162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165171661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 18356.

It is an arithmetic number, because the mean of its divisors is an integer number (24100895).

Almost surely, 2^165171668 is an apocalyptic number.

It is an amenable number.

165171668 is a deficient number, since it is larger than the sum of its proper divisors (124039072).

165171668 is a wasteful number, since it uses less digits than its factorization.

165171668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22906 (or 22904 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 165171668 is about 12851.9130093539. The cubic root of 165171668 is about 548.6708046212.

The spelling of 165171668 in words is "one hundred sixty-five million, one hundred seventy-one thousand, six hundred sixty-eight".