1216914660447 has 16 divisors (see below), whose sum is σ = 1637947212000. Its totient is φ = 803583897984.

The previous prime is 1216914660439. The next prime is 1216914660461. The reversal of 1216914660447 is 7440664196121.

It is a happy number.

It is not a de Polignac number, because 1216914660447 - 2³ = 1216914660439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216914660447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216914660407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479629 + ... + 1632137.

It is an arithmetic number, because the mean of its divisors is an integer number (102371700750).

Almost surely, 2^{1216914660447} is an apocalyptic number.

1216914660447 is a deficient number, since it is larger than the sum of its proper divisors (421032551553).

1216914660447 is a wasteful number, since it uses less digits than its factorization.

1216914660447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155850.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 1216914660447 in words is "one trillion, two hundred sixteen billion, nine hundred fourteen million, six hundred sixty thousand, four hundred forty-seven".