206631909655 has 16 divisors (see below), whose sum is σ = 266848081344. Its totient is φ = 153031150080.

The previous prime is 206631909629. The next prime is 206631909683. The reversal of 206631909655 is 556909136602.

It is not a de Polignac number, because 206631909655 - 2⁷ = 206631909527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19920747 + ... + 19931116.

It is an arithmetic number, because the mean of its divisors is an integer number (16678005084).

Almost surely, 2^206631909655 is an apocalyptic number.

206631909655 is a deficient number, since it is larger than the sum of its proper divisors (60216171689).

206631909655 is a wasteful number, since it uses less digits than its factorization.

206631909655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39851946.

The product of its (nonzero) digits is 2624400, while the sum is 52.

The spelling of 206631909655 in words is "two hundred six billion, six hundred thirty-one million, nine hundred nine thousand, six hundred fifty-five".