208944977128 has 16 divisors (see below), whose sum is σ = 402360260580. Its totient is φ = 101648907648.

The previous prime is 208944977077. The next prime is 208944977141. The reversal of 208944977128 is 821779449802.

It can be written as a sum of positive squares in 2 ways, for example, as 144155383684 + 64789593444 = 379678^2 + 254538^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 352947301 + ... + 352947892.

Almost surely, 2^208944977128 is an apocalyptic number.

It is an amenable number.

208944977128 is a deficient number, since it is larger than the sum of its proper divisors (193415283452).

208944977128 is a wasteful number, since it uses less digits than its factorization.

208944977128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705895236 (or 705895232 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 208944977128 in words is "two hundred eight billion, nine hundred forty-four million, nine hundred seventy-seven thousand, one hundred twenty-eight".