216612066 has 32 divisors (see below), whose sum is σ = 487858176. Its totient is φ = 63522000.

The previous prime is 216612047. The next prime is 216612083. The reversal of 216612066 is 660216612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50890 + ... + 54981.

It is an arithmetic number, because the mean of its divisors is an integer number (15245568).

Almost surely, 2^216612066 is an apocalyptic number.

216612066 is an abundant number, since it is smaller than the sum of its proper divisors (271246110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216612066 is a wasteful number, since it uses less digits than its factorization.

216612066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105918.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 216612066 is about 14717.7466345905. The cubic root of 216612066 is about 600.5661933183.

Adding to 216612066 its reverse (660216612), we get a palindrome (876828678).

The spelling of 216612066 in words is "two hundred sixteen million, six hundred twelve thousand, sixty-six".