206345356543 has 16 divisors (see below), whose sum is σ = 218954843136. Its totient is φ = 194042233440.

The previous prime is 206345356519. The next prime is 206345356687. The reversal of 206345356543 is 345653543602.

It is a cyclic number.

It is not a de Polignac number, because 206345356543 - 2²⁵ = 206311802111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206345356493 and 206345356502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206345356843) 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, 2887146 + ... + 2957752.

It is an arithmetic number, because the mean of its divisors is an integer number (13684677696).

Almost surely, 2^206345356543 is an apocalyptic number.

206345356543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

206345356543 is a deficient number, since it is larger than the sum of its proper divisors (12609486593).

206345356543 is a wasteful number, since it uses less digits than its factorization.

206345356543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72774.

The product of its (nonzero) digits is 3888000, while the sum is 46.

The spelling of 206345356543 in words is "two hundred six billion, three hundred forty-five million, three hundred fifty-six thousand, five hundred forty-three".