216534664 has 16 divisors (see below), whose sum is σ = 411721920. Its totient is φ = 106742160.

The previous prime is 216534649. The next prime is 216534667. The reversal of 216534664 is 466435612.

It is not an unprimeable number, because it can be changed into a prime (216534667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190044 + ... + 191179.

It is an arithmetic number, because the mean of its divisors is an integer number (25732620).

Almost surely, 2^216534664 is an apocalyptic number.

It is an amenable number.

216534664 is a deficient number, since it is larger than the sum of its proper divisors (195187256).

216534664 is a wasteful number, since it uses less digits than its factorization.

216534664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381300 (or 381296 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 216534664 is about 14715.1168530868. The cubic root of 216534664 is about 600.4946513473.

The spelling of 216534664 in words is "two hundred sixteen million, five hundred thirty-four thousand, six hundred sixty-four".