12216566215603 has 4 divisors (see below), whose sum is σ = 12447067465008. Its totient is φ = 11986064966200.

The previous prime is 12216566215591. The next prime is 12216566215621. The reversal of 12216566215603 is 30651266561221.

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

It is a cyclic number.

It is not a de Polignac number, because 12216566215603 - 2¹⁷ = 12216566084531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12216566225603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115250624623 + ... + 115250624728.

It is an arithmetic number, because the mean of its divisors is an integer number (3111766866252).

Almost surely, 2^{12216566215603} is an apocalyptic number.

12216566215603 is a deficient number, since it is larger than the sum of its proper divisors (230501249405).

12216566215603 is an equidigital number, since it uses as much as digits as its factorization.

12216566215603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230501249404.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 12216566215603 in words is "twelve trillion, two hundred sixteen billion, five hundred sixty-six million, two hundred fifteen thousand, six hundred three".