216550265 has 4 divisors (see below), whose sum is σ = 259860324. Its totient is φ = 173240208.

The previous prime is 216550259. The next prime is 216550289. The reversal of 216550265 is 562055612.

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 107723641 + 108826624 = 10379^2 + 10432^2 .

It is a cyclic number.

It is not a de Polignac number, because 216550265 - 2⁴ = 216550249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21655022 + ... + 21655031.

It is an arithmetic number, because the mean of its divisors is an integer number (64965081).

Almost surely, 2^216550265 is an apocalyptic number.

It is an amenable number.

216550265 is a deficient number, since it is larger than the sum of its proper divisors (43310059).

216550265 is an equidigital number, since it uses as much as digits as its factorization.

216550265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43310058.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 216550265 is about 14715.6469446640. The cubic root of 216550265 is about 600.5090725826.

The spelling of 216550265 in words is "two hundred sixteen million, five hundred fifty thousand, two hundred sixty-five".