216637223 has 16 divisors (see below), whose sum is σ = 240001920. Its totient is φ = 193908000.

The previous prime is 216637217. The next prime is 216637277. The reversal of 216637223 is 322736612.

It is a de Polignac number, because none of the positive numbers 2^k-216637223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216637223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216637283) 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 15 ways as a sum of consecutive naturals, for example, 251768 + ... + 252626.

It is an arithmetic number, because the mean of its divisors is an integer number (15000120).

Almost surely, 2^216637223 is an apocalyptic number.

216637223 is a deficient number, since it is larger than the sum of its proper divisors (23364697).

216637223 is a wasteful number, since it uses less digits than its factorization.

216637223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198.

The product of its digits is 18144, while the sum is 32.

The square root of 216637223 is about 14718.6012582718. The cubic root of 216637223 is about 600.5894420368.

The spelling of 216637223 in words is "two hundred sixteen million, six hundred thirty-seven thousand, two hundred twenty-three".