209839266868 has 24 divisors (see below), whose sum is σ = 457831128384. Its totient is φ = 81755558400.

The previous prime is 209839266863. The next prime is 209839266883. The reversal of 209839266868 is 868662938902.

209839266868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209839266863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340647853 + ... + 340648468.

It is an arithmetic number, because the mean of its divisors is an integer number (19076297016).

Almost surely, 2^209839266868 is an apocalyptic number.

209839266868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209839266868 is an abundant number, since it is smaller than the sum of its proper divisors (247991861516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209839266868 is a wasteful number, since it uses less digits than its factorization.

209839266868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681296343 (or 681296341 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 67.

The spelling of 209839266868 in words is "two hundred nine billion, eight hundred thirty-nine million, two hundred sixty-six thousand, eight hundred sixty-eight".