198436666 has 8 divisors (see below), whose sum is σ = 298363284. Its totient is φ = 98982240.

The previous prime is 198436643. The next prime is 198436687. The reversal of 198436666 is 666634891.

It can be written as a sum of positive squares in 2 ways, for example, as 173686041 + 24750625 = 13179^2 + 4975^2 .

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

It is a super-2 number, since 2×198436666² = 78754220826391112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116995 + ... + 118678.

Almost surely, 2^198436666 is an apocalyptic number.

198436666 is a deficient number, since it is larger than the sum of its proper divisors (99926618).

198436666 is a wasteful number, since it uses less digits than its factorization.

198436666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236096.

The product of its digits is 1119744, while the sum is 49.

The square root of 198436666 is about 14086.7549847365. The cubic root of 198436666 is about 583.2758213413.

The spelling of 198436666 in words is "one hundred ninety-eight million, four hundred thirty-six thousand, six hundred sixty-six".