4218104863561 has 2 divisors, whose sum is σ = 4218104863562. Its totient is φ = 4218104863560.

The previous prime is 4218104863529. The next prime is 4218104863571. The reversal of 4218104863561 is 1653684018124.

4218104863561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3771538782025 + 446566081536 = 1942045^2 + 668256^2 .

It is a cyclic number.

It is not a de Polignac number, because 4218104863561 - 2⁵ = 4218104863529 is a prime.

It is not a weakly prime, because it can be changed into another prime (4218104863571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2109052431780 + 2109052431781.

It is an arithmetic number, because the mean of its divisors is an integer number (2109052431781).

Almost surely, 2^{4218104863561} is an apocalyptic number.

It is an amenable number.

4218104863561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218104863561 is an equidigital number, since it uses as much as digits as its factorization.

4218104863561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 4218104863561 in words is "four trillion, two hundred eighteen billion, one hundred four million, eight hundred sixty-three thousand, five hundred sixty-one".