1998810350868 has 24 divisors (see below), whose sum is σ = 4684805133568. Its totient is φ = 663282357696.

The previous prime is 1998810350863. The next prime is 1998810350879. The reversal of 1998810350868 is 8680530188991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1998810350799 and 1998810350808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998810350863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373467121 + ... + 373472472.

Almost surely, 2^{1998810350868} is an apocalyptic number.

It is an amenable number.

1998810350868 is an abundant number, since it is smaller than the sum of its proper divisors (2685994782700).

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

1998810350868 is a wasteful number, since it uses less digits than its factorization.

1998810350868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746939823 (or 746939821 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 66.

The spelling of 1998810350868 in words is "one trillion, nine hundred ninety-eight billion, eight hundred ten million, three hundred fifty thousand, eight hundred sixty-eight".