199665985 has 8 divisors (see below), whose sum is σ = 245171520. Its totient is φ = 156017904.

The previous prime is 199665979. The next prime is 199665997. The reversal of 199665985 is 589566991.

199665985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 199665985 - 2²³ = 191277377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464125 + ... + 464554.

It is an arithmetic number, because the mean of its divisors is an integer number (30646440).

Almost surely, 2^199665985 is an apocalyptic number.

It is an amenable number.

199665985 is a deficient number, since it is larger than the sum of its proper divisors (45505535).

199665985 is an equidigital number, since it uses as much as digits as its factorization.

199665985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928727.

The product of its digits is 5248800, while the sum is 58.

The square root of 199665985 is about 14130.3214754654. The cubic root of 199665985 is about 584.4778109787.

The spelling of 199665985 in words is "one hundred ninety-nine million, six hundred sixty-five thousand, nine hundred eighty-five".