165221332 has 12 divisors (see below), whose sum is σ = 291078900. Its totient is φ = 82055936.

The previous prime is 165221293. The next prime is 165221333. The reversal of 165221332 is 233122561.

165221332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 87534736 + 77686596 = 9356^2 + 8814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165221297 and 165221306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138013 + ... + 139204.

It is an arithmetic number, because the mean of its divisors is an integer number (24256575).

Almost surely, 2^165221332 is an apocalyptic number.

It is an amenable number.

165221332 is a deficient number, since it is larger than the sum of its proper divisors (125857568).

165221332 is a wasteful number, since it uses less digits than its factorization.

165221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277370 (or 277368 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 165221332 is about 12853.8450278506. The cubic root of 165221332 is about 548.7257907588.

Adding to 165221332 its reverse (233122561), we get a palindrome (398343893).

The spelling of 165221332 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred thirty-two".