199809919908 has 48 divisors (see below), whose sum is σ = 526805832000. Its totient is φ = 65474434944.

The previous prime is 199809919847. The next prime is 199809919913. The reversal of 199809919908 is 809919908991.

199809919908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15672373 + ... + 15685116.

It is an arithmetic number, because the mean of its divisors is an integer number (10975121500).

Almost surely, 2^199809919908 is an apocalyptic number.

199809919908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199809919908 is an abundant number, since it is smaller than the sum of its proper divisors (326995912092).

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

199809919908 is a wasteful number, since it uses less digits than its factorization.

199809919908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31357561 (or 31357553 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 72.

The spelling of 199809919908 in words is "one hundred ninety-nine billion, eight hundred nine million, nine hundred nineteen thousand, nine hundred eight".