209985732446868 has 96 divisors (see below), whose sum is σ = 629170734124800. Its totient is φ = 59321812036608.

The previous prime is 209985732446827. The next prime is 209985732446879. The reversal of 209985732446868 is 868644237589902.

209985732446868 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 8 + 5 + 73 + 24 + 468 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1560376005 + ... + 1560510572.

It is an arithmetic number, because the mean of its divisors is an integer number (6553861813800).

Almost surely, 2^{209985732446868} is an apocalyptic number.

209985732446868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209985732446868 is an abundant number, since it is smaller than the sum of its proper divisors (419185001677932).

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

209985732446868 is a wasteful number, since it uses less digits than its factorization.

209985732446868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120886686 (or 3120886678 counting only the distinct ones).

The product of its (nonzero) digits is 10032906240, while the sum is 81.

The spelling of 209985732446868 in words is "two hundred nine trillion, nine hundred eighty-five billion, seven hundred thirty-two million, four hundred forty-six thousand, eight hundred sixty-eight".