1998331791067 has 2 divisors, whose sum is σ = 1998331791068. Its totient is φ = 1998331791066.

The previous prime is 1998331790971. The next prime is 1998331791077. The reversal of 1998331791067 is 7601971338991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998331791067 - 2¹¹ = 1998331789019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998331791077) 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, 999165895533 + 999165895534.

It is an arithmetic number, because the mean of its divisors is an integer number (999165895534).

Almost surely, 2^{1998331791067} is an apocalyptic number.

1998331791067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998331791067 is an equidigital number, since it uses as much as digits as its factorization.

1998331791067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The spelling of 1998331791067 in words is "one trillion, nine hundred ninety-eight billion, three hundred thirty-one million, seven hundred ninety-one thousand, sixty-seven".