198909909892 has 12 divisors (see below), whose sum is σ = 349078442076. Its totient is φ = 99173212160.

The previous prime is 198909909859. The next prime is 198909909899. The reversal of 198909909892 is 298909909891.

It can be written as a sum of positive squares in 2 ways, for example, as 35229788416 + 163680121476 = 187696^2 + 404574^2 .

It is not an unprimeable number, because it can be changed into a prime (198909909899) 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, 70434109 + ... + 70436932.

It is an arithmetic number, because the mean of its divisors is an integer number (29089870173).

Almost surely, 2^198909909892 is an apocalyptic number.

It is an amenable number.

198909909892 is a deficient number, since it is larger than the sum of its proper divisors (150168532184).

198909909892 is a wasteful number, since it uses less digits than its factorization.

198909909892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140871398 (or 140871396 counting only the distinct ones).

The product of its (nonzero) digits is 68024448, while the sum is 73.

Subtracting 198909909892 from its reverse (298909909891), we obtain a palindrome (99999999999).

The spelling of 198909909892 in words is "one hundred ninety-eight billion, nine hundred nine million, nine hundred nine thousand, eight hundred ninety-two".