165571146 has 48 divisors (see below), whose sum is σ = 388009440. Its totient is φ = 50724000.

The previous prime is 165571127. The next prime is 165571151. The reversal of 165571146 is 641175561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 165571146.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57325 + ... + 60143.

It is an arithmetic number, because the mean of its divisors is an integer number (8083530).

Almost surely, 2^165571146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165571146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194004720).

165571146 is an abundant number, since it is smaller than the sum of its proper divisors (222438294).

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

165571146 is a wasteful number, since it uses less digits than its factorization.

165571146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091 (or 3088 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 165571146 is about 12867.4452009713. The cubic root of 165571146 is about 549.1127800392.

The spelling of 165571146 in words is "one hundred sixty-five million, five hundred seventy-one thousand, one hundred forty-six".