7998998910391 has 2 divisors, whose sum is σ = 7998998910392. Its totient is φ = 7998998910390.

The previous prime is 7998998910349. The next prime is 7998998910437. The reversal of 7998998910391 is 1930198998997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7998998910391 - 2⁷ = 7998998910263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7998998910191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999499455195 + 3999499455196.

It is an arithmetic number, because the mean of its divisors is an integer number (3999499455196).

Almost surely, 2^{7998998910391} is an apocalyptic number.

7998998910391 is a deficient number, since it is larger than the sum of its proper divisors (1).

7998998910391 is an equidigital number, since it uses as much as digits as its factorization.

7998998910391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714256704, while the sum is 82.

The spelling of 7998998910391 in words is "seven trillion, nine hundred ninety-eight billion, nine hundred ninety-eight million, nine hundred ten thousand, three hundred ninety-one".