216552285 has 20 divisors (see below), whose sum is σ = 388190748. Its totient is φ = 115494336.

The previous prime is 216552269. The next prime is 216552289. The reversal of 216552285 is 582255612.

It is a happy number.

216552285 is a `hidden beast` number, since 21 + 6 + 552 + 2 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41757444 + 174794841 = 6462^2 + 13221^2 .

It is not a de Polignac number, because 216552285 - 2⁴ = 216552269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216552289) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 266944 + ... + 267753.

Almost surely, 2^216552285 is an apocalyptic number.

It is an amenable number.

216552285 is a deficient number, since it is larger than the sum of its proper divisors (171638463).

216552285 is an equidigital number, since it uses as much as digits as its factorization.

216552285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534714 (or 534705 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 216552285 is about 14715.7155789313. The cubic root of 216552285 is about 600.5109397774.

The spelling of 216552285 in words is "two hundred sixteen million, five hundred fifty-two thousand, two hundred eighty-five".