198738423099 has 24 divisors (see below), whose sum is σ = 304621949632. Its totient is φ = 129411059400.

The previous prime is 198738423097. The next prime is 198738423113. The reversal of 198738423099 is 990324837891.

198738423099 is a `hidden beast` number, since 1 + 98 + 7 + 38 + 423 + 0 + 99 = 666.

It is not a de Polignac number, because 198738423099 - 2¹ = 198738423097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198738423097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9499477 + ... + 9520374.

Almost surely, 2^198738423099 is an apocalyptic number.

198738423099 is a deficient number, since it is larger than the sum of its proper divisors (105883526533).

198738423099 is an equidigital number, since it uses as much as digits as its factorization.

198738423099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19019909 (or 19019897 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 198738423099 in words is "one hundred ninety-eight billion, seven hundred thirty-eight million, four hundred twenty-three thousand, ninety-nine".