165221146223203 has 64 divisors (see below), whose sum is σ = 200047097548800. Its totient is φ = 133403998464000.

The previous prime is 165221146223197. The next prime is 165221146223239. The reversal of 165221146223203 is 302322641122561.

It is a cyclic number.

It is not a de Polignac number, because 165221146223203 - 2¹³ = 165221146215011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165221146223603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14370799351 + ... + 14370810847.

It is an arithmetic number, because the mean of its divisors is an integer number (3125735899200).

Almost surely, 2^{165221146223203} is an apocalyptic number.

165221146223203 is a deficient number, since it is larger than the sum of its proper divisors (34825951325597).

165221146223203 is a wasteful number, since it uses less digits than its factorization.

165221146223203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16268.

The product of its (nonzero) digits is 207360, while the sum is 40.

Adding to 165221146223203 its reverse (302322641122561), we get a palindrome (467543787345764).

The spelling of 165221146223203 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred forty-six million, two hundred twenty-three thousand, two hundred three".