7944854247817 has 2 divisors, whose sum is σ = 7944854247818. Its totient is φ = 7944854247816.

The previous prime is 7944854247751. The next prime is 7944854247859. The reversal of 7944854247817 is 7187424584497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7318193606656 + 626660641161 = 2705216^2 + 791619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7944854247817 is a prime.

It is not a weakly prime, because it can be changed into another prime (7944852247817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3972427123908 + 3972427123909.

It is an arithmetic number, because the mean of its divisors is an integer number (3972427123909).

Almost surely, 2^{7944854247817} is an apocalyptic number.

It is an amenable number.

7944854247817 is a deficient number, since it is larger than the sum of its proper divisors (1).

7944854247817 is an equidigital number, since it uses as much as digits as its factorization.

7944854247817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 505774080, while the sum is 70.

The spelling of 7944854247817 in words is "seven trillion, nine hundred forty-four billion, eight hundred fifty-four million, two hundred forty-seven thousand, eight hundred seventeen".