198285634178 has 48 divisors (see below), whose sum is σ = 325307404800. Its totient is φ = 90328525056.

The previous prime is 198285634177. The next prime is 198285634241. The reversal of 198285634178 is 871436582891.

198285634178 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 198285634178.

It is not an unprimeable number, because it can be changed into a prime (198285634177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9251951 + ... + 9273357.

It is an arithmetic number, because the mean of its divisors is an integer number (6777237600).

Almost surely, 2^198285634178 is an apocalyptic number.

198285634178 is a deficient number, since it is larger than the sum of its proper divisors (127021770622).

198285634178 is a wasteful number, since it uses less digits than its factorization.

198285634178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21699 (or 21662 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 62.

The spelling of 198285634178 in words is "one hundred ninety-eight billion, two hundred eighty-five million, six hundred thirty-four thousand, one hundred seventy-eight".