216640303 has 4 divisors (see below), whose sum is σ = 236334888. Its totient is φ = 196945720.

The previous prime is 216640301. The next prime is 216640313. The reversal of 216640303 is 303046612.

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

It is a cyclic number.

It is not a de Polignac number, because 216640303 - 2¹ = 216640301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216640301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847276 + ... + 9847297.

It is an arithmetic number, because the mean of its divisors is an integer number (59083722).

Almost surely, 2^216640303 is an apocalyptic number.

216640303 is a deficient number, since it is larger than the sum of its proper divisors (19694585).

216640303 is a wasteful number, since it uses less digits than its factorization.

216640303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19694584.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 216640303 is about 14718.7058874074. The cubic root of 216640303 is about 600.5922882801.

Adding to 216640303 its reverse (303046612), we get a palindrome (519686915).

The spelling of 216640303 in words is "two hundred sixteen million, six hundred forty thousand, three hundred three".