2221716866689 has 4 divisors (see below), whose sum is σ = 2222659472724. Its totient is φ = 2220774260656.

The previous prime is 2221716866669. The next prime is 2221716866693. The reversal of 2221716866689 is 9866686171222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1432270400625 + 789446466064 = 1196775^2 + 888508^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221716866689 - 2³¹ = 2219569383041 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 2221716866689.

It is not an unprimeable number, because it can be changed into a prime (2221716866609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471299482 + ... + 471304195.

It is an arithmetic number, because the mean of its divisors is an integer number (555664868181).

Almost surely, 2^{2221716866689} is an apocalyptic number.

It is an amenable number.

2221716866689 is a deficient number, since it is larger than the sum of its proper divisors (942606035).

2221716866689 is an equidigital number, since it uses as much as digits as its factorization.

2221716866689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942606034.

The product of its digits is 41803776, while the sum is 64.

The spelling of 2221716866689 in words is "two trillion, two hundred twenty-one billion, seven hundred sixteen million, eight hundred sixty-six thousand, six hundred eighty-nine".