198351666 has 24 divisors (see below), whose sum is σ = 445680144. Its totient is φ = 66117060.

The previous prime is 198351661. The next prime is 198351683. The reversal of 198351666 is 666153891.

It is a super-3 number, since 3×198351666³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (198351661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203580 + ... + 204551.

It is an arithmetic number, because the mean of its divisors is an integer number (18570006).

Almost surely, 2^198351666 is an apocalyptic number.

198351666 is an abundant number, since it is smaller than the sum of its proper divisors (247328478).

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

198351666 is an equidigital number, since it uses as much as digits as its factorization.

198351666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408148 (or 408136 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 198351666 is about 14083.7376431116. The cubic root of 198351666 is about 583.1925277201.

The spelling of 198351666 in words is "one hundred ninety-eight million, three hundred fifty-one thousand, six hundred sixty-six".