198633336489 has 81 divisors (see below), whose sum is σ = 352564441047. Its totient is φ = 107434561248.

The previous prime is 198633336479. The next prime is 198633336511. The reversal of 198633336489 is 984633336891.

The square root of 198633336489 is 445683.

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

198633336489 is a `hidden beast` number, since 1 + 98 + 6 + 3 + 33 + 36 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8791875225 + 189841461264 = 93765^2 + 435708^2 .

It is not a de Polignac number, because 198633336489 - 2¹¹ = 198633334441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (198633336479) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 177826959 + ... + 177828075.

Almost surely, 2^198633336489 is an apocalyptic number.

198633336489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

198633336489 is the 445683-rd square number.

198633336489 is the 222842-nd centered octagonal number.

It is an amenable number.

198633336489 is a deficient number, since it is larger than the sum of its proper divisors (153931104558).

198633336489 is an equidigital number, since it uses as much as digits as its factorization.

198633336489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292 (or 1146 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 63.

The spelling of 198633336489 in words is "one hundred ninety-eight billion, six hundred thirty-three million, three hundred thirty-six thousand, four hundred eighty-nine".