198917784004 has 27 divisors (see below), whose sum is σ = 349826993607. Its totient is φ = 98969627808.

The previous prime is 198917783993. The next prime is 198917784047. The reversal of 198917784004 is 400487719891.

The square root of 198917784004 is 446002.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 37635224004 + 161282560000 = 193998^2 + 401600^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198917784004.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 239948662 + ... + 239949490.

Almost surely, 2^198917784004 is an apocalyptic number.

198917784004 is the 446002-nd square number.

It is an amenable number.

198917784004 is a deficient number, since it is larger than the sum of its proper divisors (150909209603).

198917784004 is an frugal number, since it uses more digits than its factorization.

198917784004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 198917784004 in words is "one hundred ninety-eight billion, nine hundred seventeen million, seven hundred eighty-four thousand, four".