198468664779 has 96 divisors (see below), whose sum is σ = 342096122368. Its totient is φ = 100111334400.

The previous prime is 198468664753. The next prime is 198468664813. The reversal of 198468664779 is 977466864891.

It is not a de Polignac number, because 198468664779 - 2⁷ = 198468664651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198468664779.

It is not an unprimeable number, because it can be changed into a prime (198468664739) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53681859 + ... + 53685555.

Almost surely, 2^198468664779 is an apocalyptic number.

198468664779 is a deficient number, since it is larger than the sum of its proper divisors (143627457589).

198468664779 is a wasteful number, since it uses less digits than its factorization.

198468664779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337 (or 4326 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 75.

The spelling of 198468664779 in words is "one hundred ninety-eight billion, four hundred sixty-eight million, six hundred sixty-four thousand, seven hundred seventy-nine".