206213243655 has 16 divisors (see below), whose sum is σ = 330446475360. Its totient is φ = 109811968128.

The previous prime is 206213243653. The next prime is 206213243659. The reversal of 206213243655 is 556342312602.

It is not a de Polignac number, because 206213243655 - 2¹ = 206213243653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206213243653) 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 15 ways as a sum of consecutive naturals, for example, 10516660 + ... + 10536249.

It is an arithmetic number, because the mean of its divisors is an integer number (20652904710).

Almost surely, 2^206213243655 is an apocalyptic number.

206213243655 is a deficient number, since it is larger than the sum of its proper divisors (124233231705).

206213243655 is a wasteful number, since it uses less digits than its factorization.

206213243655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21053570.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 206213243655 in words is "two hundred six billion, two hundred thirteen million, two hundred forty-three thousand, six hundred fifty-five".