199778168 has 8 divisors (see below), whose sum is σ = 374584080. Its totient is φ = 99889080.

The previous prime is 199778149. The next prime is 199778191. The reversal of 199778168 is 861877991.

199778168 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×199778168² = 79822632818872448, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 12486128 + ... + 12486143.

It is an arithmetic number, because the mean of its divisors is an integer number (46823010).

Almost surely, 2^199778168 is an apocalyptic number.

It is an amenable number.

199778168 is a deficient number, since it is larger than the sum of its proper divisors (174805912).

199778168 is a wasteful number, since it uses less digits than its factorization.

199778168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24972277 (or 24972273 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 56.

The square root of 199778168 is about 14134.2905021794. The cubic root of 199778168 is about 584.5872540872.

The spelling of 199778168 in words is "one hundred ninety-nine million, seven hundred seventy-eight thousand, one hundred sixty-eight".