201216165 has 64 divisors (see below), whose sum is σ = 353673216. Its totient is φ = 97293312.

The previous prime is 201216163. The next prime is 201216173. The reversal of 201216165 is 561612102.

It is not a de Polignac number, because 201216165 - 2¹ = 201216163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201216163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1234374 + ... + 1234536.

It is an arithmetic number, because the mean of its divisors is an integer number (5526144).

Almost surely, 2^201216165 is an apocalyptic number.

It is an amenable number.

201216165 is a deficient number, since it is larger than the sum of its proper divisors (152457051).

201216165 is a wasteful number, since it uses less digits than its factorization.

201216165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 201216165 is about 14185.0683819289. The cubic root of 201216165 is about 585.9865157431.

Adding to 201216165 its reverse (561612102), we get a palindrome (762828267).

The spelling of 201216165 in words is "two hundred one million, two hundred sixteen thousand, one hundred sixty-five".