216665332 has 12 divisors (see below), whose sum is σ = 408330916. Its totient is φ = 99999360.

The previous prime is 216665329. The next prime is 216665333. The reversal of 216665332 is 233566612.

216665332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 142945936 + 73719396 = 11956^2 + 8586^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216665333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083269 + ... + 2083372.

Almost surely, 2^216665332 is an apocalyptic number.

It is an amenable number.

216665332 is a deficient number, since it is larger than the sum of its proper divisors (191665584).

216665332 is a wasteful number, since it uses less digits than its factorization.

216665332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166658 (or 4166656 counting only the distinct ones).

The product of its digits is 38880, while the sum is 34.

The square root of 216665332 is about 14719.5561074375. The cubic root of 216665332 is about 600.6154167028.

The spelling of 216665332 in words is "two hundred sixteen million, six hundred sixty-five thousand, three hundred thirty-two".