165055217201 has 4 divisors (see below), whose sum is σ = 188634533952. Its totient is φ = 141475900452.

The previous prime is 165055217149. The next prime is 165055217209. The reversal of 165055217201 is 102712550561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165055217201 - 2¹⁸ = 165054955057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165055217209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11789658365 + ... + 11789658378.

It is an arithmetic number, because the mean of its divisors is an integer number (47158633488).

Almost surely, 2^165055217201 is an apocalyptic number.

It is an amenable number.

165055217201 is a deficient number, since it is larger than the sum of its proper divisors (23579316751).

165055217201 is an equidigital number, since it uses as much as digits as its factorization.

165055217201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23579316750.

The product of its (nonzero) digits is 21000, while the sum is 35.

Adding to 165055217201 its reverse (102712550561), we get a palindrome (267767767762).

The spelling of 165055217201 in words is "one hundred sixty-five billion, fifty-five million, two hundred seventeen thousand, two hundred one".