1998473071338 has 24 divisors (see below), whose sum is σ = 4331196358788. Its totient is φ = 665977479552.

The previous prime is 1998473071319. The next prime is 1998473071391. The reversal of 1998473071338 is 8331703748991.

1998473071338 is a `hidden beast` number, since 1 + 9 + 98 + 473 + 0 + 71 + 3 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1981582689969 + 16890381369 = 1407687^2 + 129963^2 .

It is a super-2 number, since 2×1998473071338² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14949181 + ... + 15082272.

Almost surely, 2^{1998473071338} is an apocalyptic number.

1998473071338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1998473071338 is an abundant number, since it is smaller than the sum of its proper divisors (2332723287450).

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

1998473071338 is a wasteful number, since it uses less digits than its factorization.

1998473071338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30035158 (or 30035155 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 1998473071338 in words is "one trillion, nine hundred ninety-eight billion, four hundred seventy-three million, seventy-one thousand, three hundred thirty-eight".