1998534648371 has 2 divisors, whose sum is σ = 1998534648372. Its totient is φ = 1998534648370.

The previous prime is 1998534648277. The next prime is 1998534648379. The reversal of 1998534648371 is 1738464358991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998534648371 - 2¹⁴ = 1998534631987 is a prime.

It is a super-2 number, since 2×1998534648371² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1998534648379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999267324185 + 999267324186.

It is an arithmetic number, because the mean of its divisors is an integer number (999267324186).

Almost surely, 2^{1998534648371} is an apocalyptic number.

1998534648371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998534648371 is an equidigital number, since it uses as much as digits as its factorization.

1998534648371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 68.

The spelling of 1998534648371 in words is "one trillion, nine hundred ninety-eight billion, five hundred thirty-four million, six hundred forty-eight thousand, three hundred seventy-one".