165221164 has 12 divisors (see below), whose sum is σ = 306145224. Its totient is φ = 77751104.

The previous prime is 165221107. The next prime is 165221171. The reversal of 165221164 is 461122561.

It is an unprimeable number.

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, 1214794 + ... + 1214929.

It is an arithmetic number, because the mean of its divisors is an integer number (25512102).

Almost surely, 2^165221164 is an apocalyptic number.

It is an amenable number.

165221164 is a deficient number, since it is larger than the sum of its proper divisors (140924060).

165221164 is a wasteful number, since it uses less digits than its factorization.

165221164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429744 (or 2429742 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 165221164 is about 12853.8384928394. The cubic root of 165221164 is about 548.7256047741.

The spelling of 165221164 in words is "one hundred sixty-five million, two hundred twenty-one thousand, one hundred sixty-four".