165221356 has 12 divisors (see below), whose sum is σ = 295289568. Its totient is φ = 80852912.

The previous prime is 165221341. The next prime is 165221363. The reversal of 165221356 is 653122561.

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, 439231 + ... + 439606.

It is an arithmetic number, because the mean of its divisors is an integer number (24607464).

Almost surely, 2^165221356 is an apocalyptic number.

It is an amenable number.

165221356 is a deficient number, since it is larger than the sum of its proper divisors (130068212).

165221356 is a wasteful number, since it uses less digits than its factorization.

165221356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878888 (or 878886 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 165221356 is about 12853.8459614234. The cubic root of 165221356 is about 548.7258173281.

The spelling of 165221356 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred fifty-six".