1216788216668 has 24 divisors (see below), whose sum is σ = 2155157921280. Its totient is φ = 601029650160.

The previous prime is 1216788216647. The next prime is 1216788216719. The reversal of 1216788216668 is 8666128876121.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1216788216668.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6289403 + ... + 6479981.

It is an arithmetic number, because the mean of its divisors is an integer number (89798246720).

Almost surely, 2^{1216788216668} is an apocalyptic number.

It is an amenable number.

1216788216668 is a deficient number, since it is larger than the sum of its proper divisors (938369704612).

1216788216668 is a wasteful number, since it uses less digits than its factorization.

1216788216668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209897 (or 209895 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 62.

The spelling of 1216788216668 in words is "one trillion, two hundred sixteen billion, seven hundred eighty-eight million, two hundred sixteen thousand, six hundred sixty-eight".