1998812836519 has 2 divisors, whose sum is σ = 1998812836520. Its totient is φ = 1998812836518.

The previous prime is 1998812836513. The next prime is 1998812836541. The reversal of 1998812836519 is 9156382188991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998812836519 - 2³ = 1998812836511 is a prime.

It is a super-2 number, since 2×1998812836519² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998812836511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999406418259 + 999406418260.

It is an arithmetic number, because the mean of its divisors is an integer number (999406418260).

Almost surely, 2^{1998812836519} is an apocalyptic number.

1998812836519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998812836519 is an equidigital number, since it uses as much as digits as its factorization.

1998812836519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67184640, while the sum is 70.

The spelling of 1998812836519 in words is "one trillion, nine hundred ninety-eight billion, eight hundred twelve million, eight hundred thirty-six thousand, five hundred nineteen".