99839804187 has 4 divisors (see below), whose sum is σ = 133119738920. Its totient is φ = 66559869456.

The previous prime is 99839804179. The next prime is 99839804231. The reversal of 99839804187 is 78140893899.

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

It is not a de Polignac number, because 99839804187 - 2³ = 99839804179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99839804137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16639967362 + ... + 16639967367.

It is an arithmetic number, because the mean of its divisors is an integer number (33279934730).

Almost surely, 2^99839804187 is an apocalyptic number.

99839804187 is a deficient number, since it is larger than the sum of its proper divisors (33279934733).

99839804187 is a wasteful number, since it uses less digits than its factorization.

99839804187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33279934732.

The product of its (nonzero) digits is 31352832, while the sum is 66.

The spelling of 99839804187 in words is "ninety-nine billion, eight hundred thirty-nine million, eight hundred four thousand, one hundred eighty-seven".