198439898647 has 8 divisors (see below), whose sum is σ = 200948728736. Its totient is φ = 195940518912.

The previous prime is 198439898623. The next prime is 198439898651. The reversal of 198439898647 is 746898934891.

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

It is a cyclic number.

It is not a de Polignac number, because 198439898647 - 2¹⁹ = 198439374359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198439898677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2320323 + ... + 2404324.

It is an arithmetic number, because the mean of its divisors is an integer number (25118591092).

Almost surely, 2^198439898647 is an apocalyptic number.

198439898647 is a deficient number, since it is larger than the sum of its proper divisors (2508830089).

198439898647 is an equidigital number, since it uses as much as digits as its factorization.

198439898647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725177.

The product of its digits is 752467968, while the sum is 76.

The spelling of 198439898647 in words is "one hundred ninety-eight billion, four hundred thirty-nine million, eight hundred ninety-eight thousand, six hundred forty-seven".