216066065 has 4 divisors (see below), whose sum is σ = 259279284. Its totient is φ = 172852848.

The previous prime is 216066061. The next prime is 216066077. The reversal of 216066065 is 560660612.

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 106151809 + 109914256 = 10303^2 + 10484^2 .

It is a cyclic number.

It is not a de Polignac number, because 216066065 - 2² = 216066061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216066061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21606602 + ... + 21606611.

It is an arithmetic number, because the mean of its divisors is an integer number (64819821).

Almost surely, 2^216066065 is an apocalyptic number.

It is an amenable number.

216066065 is a deficient number, since it is larger than the sum of its proper divisors (43213219).

216066065 is an equidigital number, since it uses as much as digits as its factorization.

216066065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43213218.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 216066065 is about 14699.1858618088. The cubic root of 216066065 is about 600.0611650608.

The spelling of 216066065 in words is "two hundred sixteen million, sixty-six thousand, sixty-five".