216239666 has 8 divisors (see below), whose sum is σ = 324439344. Its totient is φ = 108093220.

The previous prime is 216239641. The next prime is 216239671. The reversal of 216239666 is 666932612.

216239666 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 a super-3 number, since 3×216239666³ (a number of 26 digits) contains 333 as substring.

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, 800 + ... + 20811.

It is an arithmetic number, because the mean of its divisors is an integer number (40554918).

Almost surely, 2^216239666 is an apocalyptic number.

216239666 is a deficient number, since it is larger than the sum of its proper divisors (108199678).

216239666 is a wasteful number, since it uses less digits than its factorization.

216239666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26616.

The product of its digits is 139968, while the sum is 41.

The square root of 216239666 is about 14705.0897991138. The cubic root of 216239666 is about 600.2218309379.

The spelling of 216239666 in words is "two hundred sixteen million, two hundred thirty-nine thousand, six hundred sixty-six".