165522320 has 20 divisors (see below), whose sum is σ = 384839580. Its totient is φ = 66208896.

The previous prime is 165522307. The next prime is 165522367. The reversal of 165522320 is 23225561.

It can be written as a sum of positive squares in 2 ways, for example, as 111175936 + 54346384 = 10544^2 + 7372^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 165522320.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034435 + ... + 1034594.

It is an arithmetic number, because the mean of its divisors is an integer number (19241979).

Almost surely, 2^165522320 is an apocalyptic number.

165522320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165522320 is an abundant number, since it is smaller than the sum of its proper divisors (219317260).

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

165522320 is a wasteful number, since it uses less digits than its factorization.

165522320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069042 (or 2069036 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 165522320 is about 12865.5477924572. The cubic root of 165522320 is about 549.0587979754.

Adding to 165522320 its reverse (23225561), we get a palindrome (188747881).

The spelling of 165522320 in words is "one hundred sixty-five million, five hundred twenty-two thousand, three hundred twenty".