216668719 has 4 divisors (see below), whose sum is σ = 216700344. Its totient is φ = 216637096.

The previous prime is 216668603. The next prime is 216668839. The reversal of 216668719 is 917866612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216668719 - 2¹³ = 216660527 is a prime.

It is a super-2 number, since 2×216668719² = 93890667586201922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216608719) 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, 757 + ... + 20830.

It is an arithmetic number, because the mean of its divisors is an integer number (54175086).

Almost surely, 2^216668719 is an apocalyptic number.

216668719 is a deficient number, since it is larger than the sum of its proper divisors (31625).

216668719 is a wasteful number, since it uses less digits than its factorization.

216668719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31624.

The product of its digits is 217728, while the sum is 46.

The square root of 216668719 is about 14719.6711580116. The cubic root of 216668719 is about 600.6185463741.

The spelling of 216668719 in words is "two hundred sixteen million, six hundred sixty-eight thousand, seven hundred nineteen".