198499400799 has 16 divisors (see below), whose sum is σ = 302792700672. Its totient is φ = 113309195328.

The previous prime is 198499400783. The next prime is 198499400821. The reversal of 198499400799 is 997004994891.

It is not a de Polignac number, because 198499400799 - 2⁴ = 198499400783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198499400779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4939249 + ... + 4979274.

It is an arithmetic number, because the mean of its divisors is an integer number (18924543792).

Almost surely, 2^198499400799 is an apocalyptic number.

198499400799 is a deficient number, since it is larger than the sum of its proper divisors (104293299873).

198499400799 is an equidigital number, since it uses as much as digits as its factorization.

198499400799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9919486.

The product of its (nonzero) digits is 52907904, while the sum is 69.

The spelling of 198499400799 in words is "one hundred ninety-eight billion, four hundred ninety-nine million, four hundred thousand, seven hundred ninety-nine".