206139939841 has 16 divisors (see below), whose sum is σ = 225671156928. Its totient is φ = 186740985600.

The previous prime is 206139939829. The next prime is 206139939847. The reversal of 206139939841 is 148939931602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206139939841 - 2⁷ = 206139939713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206139939847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13354570 + ... + 13369996.

It is an arithmetic number, because the mean of its divisors is an integer number (14104447308).

Almost surely, 2^206139939841 is an apocalyptic number.

It is an amenable number.

206139939841 is a deficient number, since it is larger than the sum of its proper divisors (19531217087).

206139939841 is a wasteful number, since it uses less digits than its factorization.

206139939841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19632.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 206139939841 in words is "two hundred six billion, one hundred thirty-nine million, nine hundred thirty-nine thousand, eight hundred forty-one".