216338585 has 4 divisors (see below), whose sum is σ = 259606308. Its totient is φ = 173070864.

The previous prime is 216338581. The next prime is 216338609. The reversal of 216338585 is 585833612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60388441 + 155950144 = 7771^2 + 12488^2 .

It is a cyclic number.

It is not a de Polignac number, because 216338585 - 2² = 216338581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216338581) 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, 21633854 + ... + 21633863.

It is an arithmetic number, because the mean of its divisors is an integer number (64901577).

Almost surely, 2^216338585 is an apocalyptic number.

It is an amenable number.

216338585 is a deficient number, since it is larger than the sum of its proper divisors (43267723).

216338585 is an equidigital number, since it uses as much as digits as its factorization.

216338585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43267722.

The product of its digits is 172800, while the sum is 41.

The square root of 216338585 is about 14708.4528418185. The cubic root of 216338585 is about 600.3133409635.

The spelling of 216338585 in words is "two hundred sixteen million, three hundred thirty-eight thousand, five hundred eighty-five".