199716405599 has 4 divisors (see below), whose sum is σ = 200005431480. Its totient is φ = 199427379720.

The previous prime is 199716405571. The next prime is 199716405613. The reversal of 199716405599 is 995504617991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199716405599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199716405529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144511904 + ... + 144513285.

It is an arithmetic number, because the mean of its divisors is an integer number (50001357870).

Almost surely, 2^199716405599 is an apocalyptic number.

199716405599 is a deficient number, since it is larger than the sum of its proper divisors (289025881).

199716405599 is an equidigital number, since it uses as much as digits as its factorization.

199716405599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289025880.

The product of its (nonzero) digits is 27556200, while the sum is 65.

The spelling of 199716405599 in words is "one hundred ninety-nine billion, seven hundred sixteen million, four hundred five thousand, five hundred ninety-nine".