12217065618 has 24 divisors (see below), whose sum is σ = 25542680688. Its totient is φ = 3895295272.

The previous prime is 12217065617. The next prime is 12217065629. The reversal of 12217065618 is 81656071221.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12217065613) 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 11 ways as a sum of consecutive naturals, for example, 1921380 + ... + 1927727.

It is an arithmetic number, because the mean of its divisors is an integer number (1064278362).

Almost surely, 2^12217065618 is an apocalyptic number.

12217065618 is an abundant number, since it is smaller than the sum of its proper divisors (13325615070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12217065618 is a wasteful number, since it uses less digits than its factorization.

12217065618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849158 (or 3849135 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 12217065618 in words is "twelve billion, two hundred seventeen million, sixty-five thousand, six hundred eighteen".