198818899825 has 24 divisors (see below), whose sum is σ = 303428232128. Its totient is φ = 125845807680.

The previous prime is 198818899801. The next prime is 198818899879. The reversal of 198818899825 is 528998818891.

It is not a de Polignac number, because 198818899825 - 2¹⁵ = 198818867057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43694187 + ... + 43698736.

Almost surely, 2^198818899825 is an apocalyptic number.

It is an amenable number.

198818899825 is a deficient number, since it is larger than the sum of its proper divisors (104609332303).

198818899825 is a wasteful number, since it uses less digits than its factorization.

198818899825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87392953 (or 87392948 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 76.

The spelling of 198818899825 in words is "one hundred ninety-eight billion, eight hundred eighteen million, eight hundred ninety-nine thousand, eight hundred twenty-five".