198342857449 has 9 divisors (see below), whose sum is σ = 218018608381. Its totient is φ = 180307235020.

The previous prime is 198342857443. The next prime is 198342857509. The reversal of 198342857449 is 944758243891.

The square root of 198342857449 is 445357.

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

It is not a de Polignac number, because 198342857449 - 2⁵ = 198342857417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198342857443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4878684 + ... + 4919170.

Almost surely, 2^198342857449 is an apocalyptic number.

198342857449 is the 445357-th square number.

198342857449 is the 222679-th centered octagonal number.

It is an amenable number.

198342857449 is a deficient number, since it is larger than the sum of its proper divisors (19675750932).

198342857449 is an frugal number, since it uses more digits than its factorization.

198342857449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80996 (or 40498 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 64.

Multiplying 198342857449 by its sum of digits (64), we get a square (12693942876736 = 3562856²).

The spelling of 198342857449 in words is "one hundred ninety-eight billion, three hundred forty-two million, eight hundred fifty-seven thousand, four hundred forty-nine".