216615065 has 16 divisors (see below), whose sum is σ = 271691280. Its totient is φ = 165580800.

The previous prime is 216615059. The next prime is 216615083. The reversal of 216615065 is 560516612.

It can be written as a sum of positive squares in 8 ways, for example, as 15202201 + 201412864 = 3899^2 + 14192^2 .

It is not a de Polignac number, because 216615065 - 2⁶ = 216615001 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6365 + ... + 21765.

It is an arithmetic number, because the mean of its divisors is an integer number (16980705).

Almost surely, 2^216615065 is an apocalyptic number.

It is an amenable number.

216615065 is a deficient number, since it is larger than the sum of its proper divisors (55076215).

216615065 is a wasteful number, since it uses less digits than its factorization.

216615065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15532.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 216615065 is about 14717.8485180409. The cubic root of 216615065 is about 600.5689649239.

The spelling of 216615065 in words is "two hundred sixteen million, six hundred fifteen thousand, sixty-five".