199837999836 has 36 divisors (see below), whose sum is σ = 512260794864. Its totient is φ = 65674459200.

The previous prime is 199837999793. The next prime is 199837999841. The reversal of 199837999836 is 638999738991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39089385 + ... + 39094496.

It is an arithmetic number, because the mean of its divisors is an integer number (14229466524).

Almost surely, 2^199837999836 is an apocalyptic number.

It is an amenable number.

199837999836 is an abundant number, since it is smaller than the sum of its proper divisors (312422795028).

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

199837999836 is a wasteful number, since it uses less digits than its factorization.

199837999836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78183962 (or 78183957 counting only the distinct ones).

The product of its digits is 1428513408, while the sum is 81.

The spelling of 199837999836 in words is "one hundred ninety-nine billion, eight hundred thirty-seven million, nine hundred ninety-nine thousand, eight hundred thirty-six".