199611666 has 24 divisors (see below), whose sum is σ = 446444544. Its totient is φ = 64390680.

The previous prime is 199611649. The next prime is 199611683. The reversal of 199611666 is 666116991.

It is an interprime number because it is at equal distance from previous prime (199611649) and next prime (199611683).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178306 + ... + 179421.

It is an arithmetic number, because the mean of its divisors is an integer number (18601856).

Almost surely, 2^199611666 is an apocalyptic number.

199611666 is an abundant number, since it is smaller than the sum of its proper divisors (246832878).

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

199611666 is a wasteful number, since it uses less digits than its factorization.

199611666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357766 (or 357763 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 199611666 is about 14128.3992723875. The cubic root of 199611666 is about 584.4248039035.

The spelling of 199611666 in words is "one hundred ninety-nine million, six hundred eleven thousand, six hundred sixty-six".