216305266 has 8 divisors (see below), whose sum is σ = 325160064. Its totient is φ = 107918580.

The previous prime is 216305261. The next prime is 216305281. The reversal of 216305266 is 662503612.

216305266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (216305261) 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, 115870 + ... + 117721.

It is an arithmetic number, because the mean of its divisors is an integer number (40645008).

Almost surely, 2^216305266 is an apocalyptic number.

216305266 is a deficient number, since it is larger than the sum of its proper divisors (108854798).

216305266 is a wasteful number, since it uses less digits than its factorization.

216305266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234056.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 216305266 is about 14707.3201501837. The cubic root of 216305266 is about 600.2825206530.

Adding to 216305266 its reverse (662503612), we get a palindrome (878808878).

It can be divided in two parts, 21630 and 5266, that added together give a square (26896 = 164²).

The spelling of 216305266 in words is "two hundred sixteen million, three hundred five thousand, two hundred sixty-six".