199678115955839 has 2 divisors, whose sum is σ = 199678115955840. Its totient is φ = 199678115955838.

The previous prime is 199678115955803. The next prime is 199678115955907. The reversal of 199678115955839 is 938559511876991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199678115955839 - 2²⁸ = 199677847520383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199678115925839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99839057977919 + 99839057977920.

It is an arithmetic number, because the mean of its divisors is an integer number (99839057977920).

Almost surely, 2^{199678115955839} is an apocalyptic number.

199678115955839 is a deficient number, since it is larger than the sum of its proper divisors (1).

199678115955839 is an equidigital number, since it uses as much as digits as its factorization.

199678115955839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488000, while the sum is 86.

The spelling of 199678115955839 in words is "one hundred ninety-nine trillion, six hundred seventy-eight billion, one hundred fifteen million, nine hundred fifty-five thousand, eight hundred thirty-nine".