198666645 has 8 divisors (see below), whose sum is σ = 317866656. Its totient is φ = 105955536.

The previous prime is 198666619. The next prime is 198666647. The reversal of 198666645 is 546666891.

It is a happy number.

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

It is not a de Polignac number, because 198666645 - 2⁵ = 198666613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198666647) 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 in 7 ways as a sum of consecutive naturals, for example, 6622207 + ... + 6622236.

It is an arithmetic number, because the mean of its divisors is an integer number (39733332).

Almost surely, 2^198666645 is an apocalyptic number.

198666645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198666645 is a deficient number, since it is larger than the sum of its proper divisors (119200011).

198666645 is a wasteful number, since it uses less digits than its factorization.

198666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13244451.

The product of its digits is 1866240, while the sum is 51.

The square root of 198666645 is about 14094.9155726453. The cubic root of 198666645 is about 583.5010643286.

The spelling of 198666645 in words is "one hundred ninety-eight million, six hundred sixty-six thousand, six hundred forty-five".