206138935243 has 2 divisors, whose sum is σ = 206138935244. Its totient is φ = 206138935242.

The previous prime is 206138935241. The next prime is 206138935259. The reversal of 206138935243 is 342539831602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206138935243 - 2¹ = 206138935241 is a prime.

Together with 206138935241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 206138935193 and 206138935202.

It is not a weakly prime, because it can be changed into another prime (206138935241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103069467621 + 103069467622.

It is an arithmetic number, because the mean of its divisors is an integer number (103069467622).

Almost surely, 2^206138935243 is an apocalyptic number.

206138935243 is a deficient number, since it is larger than the sum of its proper divisors (1).

206138935243 is an equidigital number, since it uses as much as digits as its factorization.

206138935243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 206138935243 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-five thousand, two hundred forty-three".