199668985 has 8 divisors (see below), whose sum is σ = 247332096. Its totient is φ = 154582320.

The previous prime is 199668977. The next prime is 199668991. The reversal of 199668985 is 589866991.

It is a happy number.

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

It is not a de Polignac number, because 199668985 - 2³ = 199668977 is a prime.

It is a Duffinian number.

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, 643939 + ... + 644248.

It is an arithmetic number, because the mean of its divisors is an integer number (30916512).

Almost surely, 2^199668985 is an apocalyptic number.

It is an amenable number.

199668985 is a deficient number, since it is larger than the sum of its proper divisors (47663111).

199668985 is a wasteful number, since it uses less digits than its factorization.

199668985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288223.

The product of its digits is 8398080, while the sum is 61.

The square root of 199668985 is about 14130.4276297641. The cubic root of 199668985 is about 584.4807382419.

The spelling of 199668985 in words is "one hundred ninety-nine million, six hundred sixty-eight thousand, nine hundred eighty-five".