216364565 has 8 divisors (see below), whose sum is σ = 270926208. Its totient is φ = 165565840.

The previous prime is 216364529. The next prime is 216364579. The reversal of 216364565 is 565463612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216364565 - 2¹⁸ = 216102421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940601 + ... + 940830.

It is an arithmetic number, because the mean of its divisors is an integer number (33865776).

Almost surely, 2^216364565 is an apocalyptic number.

It is an amenable number.

216364565 is a deficient number, since it is larger than the sum of its proper divisors (54561643).

216364565 is a wasteful number, since it uses less digits than its factorization.

216364565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881459.

The product of its digits is 129600, while the sum is 38.

The square root of 216364565 is about 14709.3359809340. The cubic root of 216364565 is about 600.3373704516.

The spelling of 216364565 in words is "two hundred sixteen million, three hundred sixty-four thousand, five hundred sixty-five".