1216645983717 has 16 divisors (see below), whose sum is σ = 1712410656960. Its totient is φ = 766231183872.

The previous prime is 1216645983713. The next prime is 1216645983757. The reversal of 1216645983717 is 7173895466121.

It is not a de Polignac number, because 1216645983717 - 2² = 1216645983713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216645983713) 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, 30213118 + ... + 30253359.

It is an arithmetic number, because the mean of its divisors is an integer number (107025666060).

Almost surely, 2^{1216645983717} is an apocalyptic number.

It is an amenable number.

1216645983717 is a deficient number, since it is larger than the sum of its proper divisors (495764673243).

1216645983717 is a wasteful number, since it uses less digits than its factorization.

1216645983717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60466852.

The product of its digits is 15240960, while the sum is 60.

The spelling of 1216645983717 in words is "one trillion, two hundred sixteen billion, six hundred forty-five million, nine hundred eighty-three thousand, seven hundred seventeen".