198217794894 has 32 divisors (see below), whose sum is σ = 454753543680. Its totient is φ = 56423118432.

The previous prime is 198217794889. The next prime is 198217794961. The reversal of 198217794894 is 498497712891.

198217794894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8760954 + ... + 8783549.

It is an arithmetic number, because the mean of its divisors is an integer number (14211048240).

Almost surely, 2^198217794894 is an apocalyptic number.

198217794894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

198217794894 is an abundant number, since it is smaller than the sum of its proper divisors (256535748786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198217794894 is a wasteful number, since it uses less digits than its factorization.

198217794894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17544784.

The product of its digits is 73156608, while the sum is 69.

The spelling of 198217794894 in words is "one hundred ninety-eight billion, two hundred seventeen million, seven hundred ninety-four thousand, eight hundred ninety-four".