165645212 has 24 divisors (see below), whose sum is σ = 308498400. Its totient is φ = 77552640.

The previous prime is 165645209. The next prime is 165645247. The reversal of 165645212 is 212546561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7412 + ... + 19652.

It is an arithmetic number, because the mean of its divisors is an integer number (12854100).

Almost surely, 2^165645212 is an apocalyptic number.

It is an amenable number.

165645212 is a deficient number, since it is larger than the sum of its proper divisors (142853188).

165645212 is a wasteful number, since it uses less digits than its factorization.

165645212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12461 (or 12459 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 165645212 is about 12870.3229174718. The cubic root of 165645212 is about 549.1946472107.

The spelling of 165645212 in words is "one hundred sixty-five million, six hundred forty-five thousand, two hundred twelve".