199656899 has 16 divisors (see below), whose sum is σ = 219340800. Its totient is φ = 180623520.

The previous prime is 199656887. The next prime is 199656913. The reversal of 199656899 is 998656991.

It is a Cunningham number, because it is equal to 14130²-1.

It is a cyclic number.

It is not a de Polignac number, because 199656899 - 2¹⁶ = 199591363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199655899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183134 + ... + 184220.

It is an arithmetic number, because the mean of its divisors is an integer number (13708800).

Almost surely, 2^199656899 is an apocalyptic number.

199656899 is a deficient number, since it is larger than the sum of its proper divisors (19683901).

199656899 is a wasteful number, since it uses less digits than its factorization.

199656899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370.

The product of its digits is 9447840, while the sum is 62.

The square root of 199656899 is about 14129.9999646143. Note that the first 4 decimals coincide. The cubic root of 199656899 is about 584.4689450955.

The spelling of 199656899 in words is "one hundred ninety-nine million, six hundred fifty-six thousand, eight hundred ninety-nine".