216042166 has 4 divisors (see below), whose sum is σ = 324063252. Its totient is φ = 108021082.

The previous prime is 216042163. The next prime is 216042173. The reversal of 216042166 is 661240612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216042163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54010540 + ... + 54010543.

It is an arithmetic number, because the mean of its divisors is an integer number (81015813).

Almost surely, 2^216042166 is an apocalyptic number.

216042166 is a deficient number, since it is larger than the sum of its proper divisors (108021086).

216042166 is a wasteful number, since it uses less digits than its factorization.

216042166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108021085.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 216042166 is about 14698.3729031482. The cubic root of 216042166 is about 600.0390400523.

Adding to 216042166 its reverse (661240612), we get a palindrome (877282778).

The spelling of 216042166 in words is "two hundred sixteen million, forty-two thousand, one hundred sixty-six".