199668613249 has 16 divisors (see below), whose sum is σ = 233871464448. Its totient is φ = 166911190992.

The previous prime is 199668613223. The next prime is 199668613253. The reversal of 199668613249 is 942316866991.

It is a happy number.

It is not a de Polignac number, because 199668613249 - 2¹¹ = 199668611201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199668613849) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 979147 + ... + 1165360.

It is an arithmetic number, because the mean of its divisors is an integer number (14616966528).

Almost surely, 2^199668613249 is an apocalyptic number.

It is an amenable number.

199668613249 is a deficient number, since it is larger than the sum of its proper divisors (34202851199).

199668613249 is a wasteful number, since it uses less digits than its factorization.

199668613249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144844.

The product of its digits is 30233088, while the sum is 64.

The spelling of 199668613249 in words is "one hundred ninety-nine billion, six hundred sixty-eight million, six hundred thirteen thousand, two hundred forty-nine".