208888564889 has 8 divisors (see below), whose sum is σ = 210240805320. Its totient is φ = 207538502400.

The previous prime is 208888564861. The next prime is 208888564901. The reversal of 208888564889 is 988465888802.

It can be written as a sum of positive squares in 4 ways, for example, as 3003289 + 208885561600 = 1733^2 + 457040^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208888564889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208888564849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351824 + ... + 735905.

It is an arithmetic number, because the mean of its divisors is an integer number (26280100665).

Almost surely, 2^208888564889 is an apocalyptic number.

It is an amenable number.

208888564889 is a deficient number, since it is larger than the sum of its proper divisors (1352240431).

208888564889 is a wasteful number, since it uses less digits than its factorization.

208888564889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088971.

The product of its (nonzero) digits is 566231040, while the sum is 74.

The spelling of 208888564889 in words is "two hundred eight billion, eight hundred eighty-eight million, five hundred sixty-four thousand, eight hundred eighty-nine".