199969966 has 16 divisors (see below), whose sum is σ = 343203840. Its totient is φ = 85601880.

The previous prime is 199969961. The next prime is 199969967. The reversal of 199969966 is 669969991.

It is a junction number, because it is equal to n+sod(n) for n = 199969898 and 199969907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199969961) 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 7 ways as a sum of consecutive naturals, for example, 4915 + ... + 20593.

It is an arithmetic number, because the mean of its divisors is an integer number (21450240).

Almost surely, 2^199969966 is an apocalyptic number.

199969966 is a deficient number, since it is larger than the sum of its proper divisors (143233874).

199969966 is a wasteful number, since it uses less digits than its factorization.

199969966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16599.

The product of its digits is 12754584, while the sum is 64.

The square root of 199969966 is about 14141.0737216097. The cubic root of 199969966 is about 584.7742728609.

The spelling of 199969966 in words is "one hundred ninety-nine million, nine hundred sixty-nine thousand, nine hundred sixty-six".