199999999999999 has 4 divisors (see below), whose sum is σ = 208695652173936. Its totient is φ = 191304347826064.

The previous prime is 199999999999997. The next prime is 200000000000027. The reversal of 199999999999999 is 999999999999991.

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 199999999999999 - 2¹ = 199999999999997 is a prime.

It is a super-9 number, since 9×199999999999999⁹ (a number of 130 digits) contains 999999999 as substring.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 1 and 99999999999999 contains 199999999999999 itself.

It is a Duffinian number.

199999999999999 is a modest number, since divided by 99999999 gives 1999999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999999999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4347826086934 + ... + 4347826086979.

It is an arithmetic number, because the mean of its divisors is an integer number (52173913043484).

Almost surely, 2^{199999999999999} is an apocalyptic number.

199999999999999 is a deficient number, since it is larger than the sum of its proper divisors (8695652173937).

199999999999999 is an equidigital number, since it uses as much as digits as its factorization.

199999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8695652173936.

The product of its digits is 22876792454961, while the sum is 127.

It can be divided in two parts, 19 and 9999999999999, that multiplied together give a palindrome (189999999999981).

The spelling of 199999999999999 in words is "one hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".