198385040866 has 4 divisors (see below), whose sum is σ = 297577561302. Its totient is φ = 99192520432.

The previous prime is 198385040863. The next prime is 198385040881. The reversal of 198385040866 is 668040583891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 99524475625 + 98860565241 = 315475^2 + 314421^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 198385040866.

It is not an unprimeable number, because it can be changed into a prime (198385040863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49596260215 + ... + 49596260218.

Almost surely, 2^198385040866 is an apocalyptic number.

198385040866 is a deficient number, since it is larger than the sum of its proper divisors (99192520436).

198385040866 is an equidigital number, since it uses as much as digits as its factorization.

198385040866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99192520435.

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 198385040866 in words is "one hundred ninety-eight billion, three hundred eighty-five million, forty thousand, eight hundred sixty-six".