1216983559439 has 2 divisors, whose sum is σ = 1216983559440. Its totient is φ = 1216983559438.

The previous prime is 1216983559427. The next prime is 1216983559459. The reversal of 1216983559439 is 9349553896121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216983559439 - 2¹² = 1216983555343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216983559459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608491779719 + 608491779720.

It is an arithmetic number, because the mean of its divisors is an integer number (608491779720).

Almost surely, 2^{1216983559439} is an apocalyptic number.

1216983559439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216983559439 is an equidigital number, since it uses as much as digits as its factorization.

1216983559439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62985600, while the sum is 65.

The spelling of 1216983559439 in words is "one trillion, two hundred sixteen billion, nine hundred eighty-three million, five hundred fifty-nine thousand, four hundred thirty-nine".