1821811500198 has 48 divisors (see below), whose sum is σ = 4065624248400. Its totient is φ = 589154948928.

The previous prime is 1821811500191. The next prime is 1821811500253. The reversal of 1821811500198 is 8910051181281.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821811500191) 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 23 ways as a sum of consecutive naturals, for example, 3710473 + ... + 4172676.

It is an arithmetic number, because the mean of its divisors is an integer number (84700505175).

Almost surely, 2^{1821811500198} is an apocalyptic number.

1821811500198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1821811500198 is an abundant number, since it is smaller than the sum of its proper divisors (2243812748202).

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

1821811500198 is a wasteful number, since it uses less digits than its factorization.

1821811500198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7883541 (or 7883538 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 45.

The spelling of 1821811500198 in words is "one trillion, eight hundred twenty-one billion, eight hundred eleven million, five hundred thousand, one hundred ninety-eight".