209939686144 has 36 divisors (see below), whose sum is σ = 422258288760. Its totient is φ = 104168529920.

The previous prime is 209939686141. The next prime is 209939686157. The reversal of 209939686144 is 441686939902.

It is not an unprimeable number, because it can be changed into a prime (209939686141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3096529 + ... + 3163600.

It is an arithmetic number, because the mean of its divisors is an integer number (11729396910).

Almost surely, 2^209939686144 is an apocalyptic number.

It is an amenable number.

209939686144 is an abundant number, since it is smaller than the sum of its proper divisors (212318602616).

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

209939686144 is an equidigital number, since it uses as much as digits as its factorization.

209939686144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260276 (or 6260262 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 209939686144 in words is "two hundred nine billion, nine hundred thirty-nine million, six hundred eighty-six thousand, one hundred forty-four".