209671988168 has 32 divisors (see below), whose sum is σ = 401562675360. Its totient is φ = 102610535040.

The previous prime is 209671988117. The next prime is 209671988203. The reversal of 209671988168 is 861889176902.

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 7 ways as a sum of consecutive naturals, for example, 1293830 + ... + 1446837.

It is an arithmetic number, because the mean of its divisors is an integer number (12548833605).

Almost surely, 2^209671988168 is an apocalyptic number.

It is an amenable number.

209671988168 is a deficient number, since it is larger than the sum of its proper divisors (191890687192).

209671988168 is a wasteful number, since it uses less digits than its factorization.

209671988168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740877 (or 2740873 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 65.

The spelling of 209671988168 in words is "two hundred nine billion, six hundred seventy-one million, nine hundred eighty-eight thousand, one hundred sixty-eight".