206563815213 has 16 divisors (see below), whose sum is σ = 315368078976. Its totient is φ = 117809902080.

The previous prime is 206563815209. The next prime is 206563815217. The reversal of 206563815213 is 312518365602.

It is an interprime number because it is at equal distance from previous prime (206563815209) and next prime (206563815217).

It is not a de Polignac number, because 206563815213 - 2² = 206563815209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206563815217) by changing a digit.

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, 9428956 + ... + 9450837.

It is an arithmetic number, because the mean of its divisors is an integer number (19710504936).

Almost surely, 2^206563815213 is an apocalyptic number.

It is an amenable number.

206563815213 is a deficient number, since it is larger than the sum of its proper divisors (108804263763).

206563815213 is a wasteful number, since it uses less digits than its factorization.

206563815213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18880324.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 206563815213 in words is "two hundred six billion, five hundred sixty-three million, eight hundred fifteen thousand, two hundred thirteen".