216668866871 has 8 divisors (see below), whose sum is σ = 229563967824. Its totient is φ = 203790418560.

The previous prime is 216668866861. The next prime is 216668866901. The reversal of 216668866871 is 178668866612.

216668866871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216668866871 - 2⁶ = 216668866807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216668866798 and 216668866807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216668866801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4136360 + ... + 4188413.

It is an arithmetic number, because the mean of its divisors is an integer number (28695495978).

Almost surely, 2^216668866871 is an apocalyptic number.

216668866871 is a deficient number, since it is larger than the sum of its proper divisors (12895100953).

216668866871 is a wasteful number, since it uses less digits than its factorization.

216668866871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8326321.

The product of its digits is 55738368, while the sum is 65.

The spelling of 216668866871 in words is "two hundred sixteen billion, six hundred sixty-eight million, eight hundred sixty-six thousand, eight hundred seventy-one".