165601222 has 16 divisors (see below), whose sum is σ = 252648000. Its totient is φ = 81394560.

The previous prime is 165601217. The next prime is 165601229. The reversal of 165601222 is 222106561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165601229) 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 7 ways as a sum of consecutive naturals, for example, 35904 + ... + 40252.

It is an arithmetic number, because the mean of its divisors is an integer number (15790500).

Almost surely, 2^165601222 is an apocalyptic number.

165601222 is a deficient number, since it is larger than the sum of its proper divisors (87046778).

165601222 is a wasteful number, since it uses less digits than its factorization.

165601222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 165601222 is about 12868.6138336652. The cubic root of 165601222 is about 549.1460268065.

Adding to 165601222 its reverse (222106561), we get a palindrome (387707783).

The spelling of 165601222 in words is "one hundred sixty-five million, six hundred one thousand, two hundred twenty-two".