208385738389 has 2 divisors, whose sum is σ = 208385738390. Its totient is φ = 208385738388.

The previous prime is 208385738381. The next prime is 208385738411. The reversal of 208385738389 is 983837583802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193101361489 + 15284376900 = 439433^2 + 123630^2 .

It is a cyclic number.

It is not a de Polignac number, because 208385738389 - 2³ = 208385738381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208385738389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208385738381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104192869194 + 104192869195.

It is an arithmetic number, because the mean of its divisors is an integer number (104192869195).

Almost surely, 2^208385738389 is an apocalyptic number.

It is an amenable number.

208385738389 is a deficient number, since it is larger than the sum of its proper divisors (1).

208385738389 is an equidigital number, since it uses as much as digits as its factorization.

208385738389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 208385738389 in words is "two hundred eight billion, three hundred eighty-five million, seven hundred thirty-eight thousand, three hundred eighty-nine".