1213604166217 has 2 divisors, whose sum is σ = 1213604166218. Its totient is φ = 1213604166216.

The previous prime is 1213604166209. The next prime is 1213604166223. The reversal of 1213604166217 is 7126614063121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1114099249081 + 99504917136 = 1055509^2 + 315444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213604166217 - 2³ = 1213604166209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213604166217.

It is not a weakly prime, because it can be changed into another prime (1213604166277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606802083108 + 606802083109.

It is an arithmetic number, because the mean of its divisors is an integer number (606802083109).

Almost surely, 2^{1213604166217} is an apocalyptic number.

It is an amenable number.

1213604166217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213604166217 is an equidigital number, since it uses as much as digits as its factorization.

1213604166217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 1213604166217 in words is "one trillion, two hundred thirteen billion, six hundred four million, one hundred sixty-six thousand, two hundred seventeen".