165222056 has 8 divisors (see below), whose sum is σ = 309791370. Its totient is φ = 82611024.

The previous prime is 165222053. The next prime is 165222059. The reversal of 165222056 is 650222561.

It is an interprime number because it is at equal distance from previous prime (165222053) and next prime (165222059).

It can be written as a sum of positive squares in only one way, i.e., 163072900 + 2149156 = 12770^2 + 1466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (165222053) by changing a digit.

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 as a sum of consecutive naturals, namely, 10326371 + ... + 10326386.

Almost surely, 2^165222056 is an apocalyptic number.

It is an amenable number.

165222056 is a deficient number, since it is larger than the sum of its proper divisors (144569314).

165222056 is a wasteful number, since it uses less digits than its factorization.

165222056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20652763 (or 20652759 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 165222056 is about 12853.8731905990. The cubic root of 165222056 is about 548.7265922633.

The spelling of 165222056 in words is "one hundred sixty-five million, two hundred twenty-two thousand, fifty-six".