1217155505603 has 2 divisors, whose sum is σ = 1217155505604. Its totient is φ = 1217155505602.

The previous prime is 1217155505581. The next prime is 1217155505641. The reversal of 1217155505603 is 3065055517121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1217155505603 - 2³⁰ = 1216081763779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217155505003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608577752801 + 608577752802.

It is an arithmetic number, because the mean of its divisors is an integer number (608577752802).

Almost surely, 2^{1217155505603} is an apocalyptic number.

1217155505603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217155505603 is an equidigital number, since it uses as much as digits as its factorization.

1217155505603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157500, while the sum is 41.

The spelling of 1217155505603 in words is "one trillion, two hundred seventeen billion, one hundred fifty-five million, five hundred five thousand, six hundred three".