199820758447 has 2 divisors, whose sum is σ = 199820758448. Its totient is φ = 199820758446.

The previous prime is 199820758387. The next prime is 199820758457. The reversal of 199820758447 is 744857028991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199820758447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199820758457) 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 as a sum of consecutive naturals, namely, 99910379223 + 99910379224.

It is an arithmetic number, because the mean of its divisors is an integer number (99910379224).

Almost surely, 2^199820758447 is an apocalyptic number.

199820758447 is a deficient number, since it is larger than the sum of its proper divisors (1).

199820758447 is an equidigital number, since it uses as much as digits as its factorization.

199820758447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40642560, while the sum is 64.

The spelling of 199820758447 in words is "one hundred ninety-nine billion, eight hundred twenty million, seven hundred fifty-eight thousand, four hundred forty-seven".