1998810350879 has 2 divisors, whose sum is σ = 1998810350880. Its totient is φ = 1998810350878.

The previous prime is 1998810350863. The next prime is 1998810350909. The reversal of 1998810350879 is 9780530188991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998810350879 - 2⁴ = 1998810350863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998810320879) 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, 999405175439 + 999405175440.

It is an arithmetic number, because the mean of its divisors is an integer number (999405175440).

Almost surely, 2^{1998810350879} is an apocalyptic number.

1998810350879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998810350879 is an equidigital number, since it uses as much as digits as its factorization.

1998810350879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 68.

The spelling of 1998810350879 in words is "one trillion, nine hundred ninety-eight billion, eight hundred ten million, three hundred fifty thousand, eight hundred seventy-nine".