198980438705 has 8 divisors (see below), whose sum is σ = 242690896104. Its totient is φ = 156574771200.

The previous prime is 198980438639. The next prime is 198980438717. The reversal of 198980438705 is 507834089891.

It can be written as a sum of positive squares in 4 ways, for example, as 11841139489 + 187139299216 = 108817^2 + 432596^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198980438705 - 2¹⁸ = 198980176561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326197136 + ... + 326197745.

It is an arithmetic number, because the mean of its divisors is an integer number (30336362013).

Almost surely, 2^198980438705 is an apocalyptic number.

It is an amenable number.

198980438705 is a deficient number, since it is larger than the sum of its proper divisors (43710457399).

198980438705 is an equidigital number, since it uses as much as digits as its factorization.

198980438705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652394947.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 198980438705 in words is "one hundred ninety-eight billion, nine hundred eighty million, four hundred thirty-eight thousand, seven hundred five".