199438813205 has 16 divisors (see below), whose sum is σ = 245087156160. Its totient is φ = 155716568448.

The previous prime is 199438813187. The next prime is 199438813219. The reversal of 199438813205 is 502318834991.

It is a cyclic number.

It is not a de Polignac number, because 199438813205 - 2³⁰ = 198365071381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97712 + ... + 639081.

It is an arithmetic number, because the mean of its divisors is an integer number (15317947260).

Almost surely, 2^199438813205 is an apocalyptic number.

It is an amenable number.

199438813205 is a deficient number, since it is larger than the sum of its proper divisors (45648342955).

199438813205 is a wasteful number, since it uses less digits than its factorization.

199438813205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738100.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 199438813205 in words is "one hundred ninety-nine billion, four hundred thirty-eight million, eight hundred thirteen thousand, two hundred five".