208638105199 has 2 divisors, whose sum is σ = 208638105200. Its totient is φ = 208638105198.

The previous prime is 208638105173. The next prime is 208638105217. The reversal of 208638105199 is 991501836802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208638105199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208638106199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104319052599 + 104319052600.

It is an arithmetic number, because the mean of its divisors is an integer number (104319052600).

Almost surely, 2^208638105199 is an apocalyptic number.

208638105199 is a deficient number, since it is larger than the sum of its proper divisors (1).

208638105199 is an equidigital number, since it uses as much as digits as its factorization.

208638105199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 208638105199 in words is "two hundred eight billion, six hundred thirty-eight million, one hundred five thousand, one hundred ninety-nine".