165215222 has 24 divisors (see below), whose sum is σ = 265575000. Its totient is φ = 76871808.

The previous prime is 165215221. The next prime is 165215251. The reversal of 165215222 is 222512561.

It is a junction number, because it is equal to n+sod(n) for n = 165215191 and 165215200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131654 + ... + 132902.

It is an arithmetic number, because the mean of its divisors is an integer number (11065625).

Almost surely, 2^165215222 is an apocalyptic number.

165215222 is a deficient number, since it is larger than the sum of its proper divisors (100359778).

165215222 is a wasteful number, since it uses less digits than its factorization.

165215222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1329 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 165215222 is about 12853.6073535798. The cubic root of 165215222 is about 548.7190265881.

Adding to 165215222 its reverse (222512561), we get a palindrome (387727783).

The spelling of 165215222 in words is "one hundred sixty-five million, two hundred fifteen thousand, two hundred twenty-two".