206605646605 has 16 divisors (see below), whose sum is σ = 250317010944. Its totient is φ = 163695591360.

The previous prime is 206605646603. The next prime is 206605646609. The reversal of 206605646605 is 506646506602.

It is not a de Polignac number, because 206605646605 - 2¹ = 206605646603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206605646603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77679 + ... + 647491.

It is an arithmetic number, because the mean of its divisors is an integer number (15644813184).

Almost surely, 2^206605646605 is an apocalyptic number.

It is an amenable number.

206605646605 is a deficient number, since it is larger than the sum of its proper divisors (43711364339).

206605646605 is a wasteful number, since it uses less digits than its factorization.

206605646605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570516.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 206605646605 in words is "two hundred six billion, six hundred five million, six hundred forty-six thousand, six hundred five".