198166279 has 2 divisors, whose sum is σ = 198166280. Its totient is φ = 198166278.

The previous prime is 198166277. The next prime is 198166289. The reversal of 198166279 is 972661891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198166279 - 2¹ = 198166277 is a prime.

Together with 198166277, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198166277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99083139 + 99083140.

It is an arithmetic number, because the mean of its divisors is an integer number (99083140).

Almost surely, 2^198166279 is an apocalyptic number.

198166279 is a deficient number, since it is larger than the sum of its proper divisors (1).

198166279 is an equidigital number, since it uses as much as digits as its factorization.

198166279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 198166279 is about 14077.1545065045. The cubic root of 198166279 is about 583.0107797906.

The spelling of 198166279 in words is "one hundred ninety-eight million, one hundred sixty-six thousand, two hundred seventy-nine".