1998534648372 has 48 divisors (see below), whose sum is σ = 4854887900352. Its totient is φ = 639294301440.

The previous prime is 1998534648371. The next prime is 1998534648379. The reversal of 1998534648372 is 2738464358991.

It is a junction number, because it is equal to n+sod(n) for n = 1998534648297 and 1998534648306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998534648371) 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 in 15 ways as a sum of consecutive naturals, for example, 30797754 + ... + 30862577.

It is an arithmetic number, because the mean of its divisors is an integer number (101143497924).

Almost surely, 2^{1998534648372} is an apocalyptic number.

1998534648372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1998534648372 is an abundant number, since it is smaller than the sum of its proper divisors (2856353251980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998534648372 is a wasteful number, since it uses less digits than its factorization.

1998534648372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61660448 (or 61660446 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 69.

The spelling of 1998534648372 in words is "one trillion, nine hundred ninety-eight billion, five hundred thirty-four million, six hundred forty-eight thousand, three hundred seventy-two".