216718667 has 8 divisors (see below), whose sum is σ = 241919040. Its totient is φ = 192434760.

The previous prime is 216718651. The next prime is 216718679. The reversal of 216718667 is 766817612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216718667 - 2⁴ = 216718651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216718687) 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 7 ways as a sum of consecutive naturals, for example, 228617 + ... + 229562.

It is an arithmetic number, because the mean of its divisors is an integer number (30239880).

Almost surely, 2^216718667 is an apocalyptic number.

216718667 is a deficient number, since it is larger than the sum of its proper divisors (25200373).

216718667 is a wasteful number, since it uses less digits than its factorization.

216718667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458233.

The product of its digits is 169344, while the sum is 44.

The square root of 216718667 is about 14721.3677014060. The cubic root of 216718667 is about 600.6646957680.

The spelling of 216718667 in words is "two hundred sixteen million, seven hundred eighteen thousand, six hundred sixty-seven".