216868318667 has 32 divisors (see below), whose sum is σ = 298281844224. Its totient is φ = 152184556800.

The previous prime is 216868318663. The next prime is 216868318669. The reversal of 216868318667 is 766813868612.

It is a cyclic number.

It is not a de Polignac number, because 216868318667 - 2² = 216868318663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216868318661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2601053 + ... + 2683134.

It is an arithmetic number, because the mean of its divisors is an integer number (9321307632).

Almost surely, 2^216868318667 is an apocalyptic number.

216868318667 is a deficient number, since it is larger than the sum of its proper divisors (81413525557).

216868318667 is a wasteful number, since it uses less digits than its factorization.

216868318667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284259.

The product of its digits is 27869184, while the sum is 62.

Subtracting 216868318667 from its reverse (766813868612), we obtain a palindrome (549945549945).

It can be divided in two parts, 216868 and 318667, that added together give a palindrome (535535).

The spelling of 216868318667 in words is "two hundred sixteen billion, eight hundred sixty-eight million, three hundred eighteen thousand, six hundred sixty-seven".