208869045204389 has 4 divisors (see below), whose sum is σ = 210150450389856. Its totient is φ = 207587640018924.

The previous prime is 208869045204361. The next prime is 208869045204419. The reversal of 208869045204389 is 983402540968802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208869045204389 - 2⁸ = 208869045204133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208869045204329) 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, 640702592489 + ... + 640702592814.

It is an arithmetic number, because the mean of its divisors is an integer number (52537612597464).

Almost surely, 2^{208869045204389} is an apocalyptic number.

It is an amenable number.

208869045204389 is a deficient number, since it is larger than the sum of its proper divisors (1281405185467).

208869045204389 is a wasteful number, since it uses less digits than its factorization.

208869045204389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281405185466.

The product of its (nonzero) digits is 238878720, while the sum is 68.

The spelling of 208869045204389 in words is "two hundred eight trillion, eight hundred sixty-nine billion, forty-five million, two hundred four thousand, three hundred eighty-nine".