1998534648379 has 2 divisors, whose sum is σ = 1998534648380. Its totient is φ = 1998534648378.

The previous prime is 1998534648371. The next prime is 1998534648427. The reversal of 1998534648379 is 9738464358991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998534648379 - 2³ = 1998534648371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998534648371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999267324189 + 999267324190.

It is an arithmetic number, because the mean of its divisors is an integer number (999267324190).

Almost surely, 2^{1998534648379} is an apocalyptic number.

1998534648379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998534648379 is an equidigital number, since it uses as much as digits as its factorization.

1998534648379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1410877440, while the sum is 76.

The spelling of 1998534648379 in words is "one trillion, nine hundred ninety-eight billion, five hundred thirty-four million, six hundred forty-eight thousand, three hundred seventy-nine".