199965479999 has 4 divisors (see below), whose sum is σ = 199981437480. Its totient is φ = 199949522520.

The previous prime is 199965479983. The next prime is 199965480017. The reversal of 199965479999 is 999974569991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 199965479999 - 2⁴ = 199965479983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199965479999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199965479939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7959929 + ... + 7985010.

It is an arithmetic number, because the mean of its divisors is an integer number (49995359370).

Almost surely, 2^199965479999 is an apocalyptic number.

199965479999 is a deficient number, since it is larger than the sum of its proper divisors (15957481).

199965479999 is a wasteful number, since it uses less digits than its factorization.

199965479999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15957480.

The product of its digits is 4017693960, while the sum is 86.

The spelling of 199965479999 in words is "one hundred ninety-nine billion, nine hundred sixty-five million, four hundred seventy-nine thousand, nine hundred ninety-nine".