216281414369665 has 4 divisors (see below), whose sum is σ = 259537697243604. Its totient is φ = 173025131495728.

The previous prime is 216281414369551. The next prime is 216281414369743. The reversal of 216281414369665 is 566963414182612.

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 29266271448561 + 187015142921104 = 5409831^2 + 13675348^2 .

It is a cyclic number.

It is not a de Polignac number, because 216281414369665 - 2¹¹ = 216281414367617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216281414369597 and 216281414369606.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21628141436962 + ... + 21628141436971.

It is an arithmetic number, because the mean of its divisors is an integer number (64884424310901).

Almost surely, 2^{216281414369665} is an apocalyptic number.

It is an amenable number.

216281414369665 is a deficient number, since it is larger than the sum of its proper divisors (43256282873939).

216281414369665 is an equidigital number, since it uses as much as digits as its factorization.

216281414369665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43256282873938.

The product of its digits is 89579520, while the sum is 64.

The spelling of 216281414369665 in words is "two hundred sixteen trillion, two hundred eighty-one billion, four hundred fourteen million, three hundred sixty-nine thousand, six hundred sixty-five".