198669618 has 48 divisors (see below), whose sum is σ = 513574560. Its totient is φ = 56761992.

The previous prime is 198669577. The next prime is 198669631. The reversal of 198669618 is 816966891.

198669618 is a `hidden beast` number, since 19 + 8 + 6 + 6 + 9 + 618 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 23 ways as a sum of consecutive naturals, for example, 34896 + ... + 40187.

It is an arithmetic number, because the mean of its divisors is an integer number (10699470).

Almost surely, 2^198669618 is an apocalyptic number.

198669618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198669618 is an abundant number, since it is smaller than the sum of its proper divisors (314904942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198669618 is a wasteful number, since it uses less digits than its factorization.

198669618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75108 (or 75095 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 198669618 is about 14095.0210358126. The cubic root of 198669618 is about 583.5039749665.

The spelling of 198669618 in words is "one hundred ninety-eight million, six hundred sixty-nine thousand, six hundred eighteen".