198554323618 has 16 divisors (see below), whose sum is σ = 341055550080. Its totient is φ = 84925532736.

The previous prime is 198554323559. The next prime is 198554323631. The reversal of 198554323618 is 816323455891.

It is an unprimeable number.

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, 14090823 + ... + 14104906.

It is an arithmetic number, because the mean of its divisors is an integer number (21315971880).

Almost surely, 2^198554323618 is an apocalyptic number.

198554323618 is a deficient number, since it is larger than the sum of its proper divisors (142501226462).

198554323618 is a wasteful number, since it uses less digits than its factorization.

198554323618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28196241.

The product of its digits is 6220800, while the sum is 55.

The spelling of 198554323618 in words is "one hundred ninety-eight billion, five hundred fifty-four million, three hundred twenty-three thousand, six hundred eighteen".