1998198181835 has 4 divisors (see below), whose sum is σ = 2397837818208. Its totient is φ = 1598558545464.

The previous prime is 1998198181829. The next prime is 1998198181843. The reversal of 1998198181835 is 5381818918991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998198181835 - 2³⁰ = 1997124440011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199819818179 + ... + 199819818188.

It is an arithmetic number, because the mean of its divisors is an integer number (599459454552).

Almost surely, 2^{1998198181835} is an apocalyptic number.

1998198181835 is a deficient number, since it is larger than the sum of its proper divisors (399639636373).

1998198181835 is an equidigital number, since it uses as much as digits as its factorization.

1998198181835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399639636372.

The product of its digits is 44789760, while the sum is 71.

The spelling of 1998198181835 in words is "one trillion, nine hundred ninety-eight billion, one hundred ninety-eight million, one hundred eighty-one thousand, eight hundred thirty-five".