216542366 has 16 divisors (see below), whose sum is σ = 328925184. Its totient is φ = 106908984.

The previous prime is 216542351. The next prime is 216542393. The reversal of 216542366 is 663245612.

It is a happy number.

216542366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54731 + ... + 58553.

It is an arithmetic number, because the mean of its divisors is an integer number (20557824).

Almost surely, 2^216542366 is an apocalyptic number.

216542366 is a deficient number, since it is larger than the sum of its proper divisors (112382818).

216542366 is a wasteful number, since it uses less digits than its factorization.

216542366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175.

The product of its digits is 51840, while the sum is 35.

The square root of 216542366 is about 14715.3785544239. The cubic root of 216542366 is about 600.5017710002.

Adding to 216542366 its reverse (663245612), we get a palindrome (879787978).

The spelling of 216542366 in words is "two hundred sixteen million, five hundred forty-two thousand, three hundred sixty-six".