2216115585681 has 4 divisors (see below), whose sum is σ = 2954820780912. Its totient is φ = 1477410390452.

The previous prime is 2216115585589. The next prime is 2216115585731. The reversal of 2216115585681 is 1865855116122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2216115585681 - 2⁹ = 2216115585169 is a prime.

It is a super-2 number, since 2×2216115585681² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2216117585681) 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 3 ways as a sum of consecutive naturals, for example, 369352597611 + ... + 369352597616.

It is an arithmetic number, because the mean of its divisors is an integer number (738705195228).

Almost surely, 2^{2216115585681} is an apocalyptic number.

It is an amenable number.

2216115585681 is a deficient number, since it is larger than the sum of its proper divisors (738705195231).

2216115585681 is an equidigital number, since it uses as much as digits as its factorization.

2216115585681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738705195230.

The product of its digits is 1152000, while the sum is 51.

The spelling of 2216115585681 in words is "two trillion, two hundred sixteen billion, one hundred fifteen million, five hundred eighty-five thousand, six hundred eighty-one".