206326782017 has 4 divisors (see below), whose sum is σ = 211359142596. Its totient is φ = 201294421440.

The previous prime is 206326782007. The next prime is 206326782029. The reversal of 206326782017 is 710287623602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710287623602 = 2 ⋅355143811801.

It can be written as a sum of positive squares in 2 ways, for example, as 71961281536 + 134365500481 = 268256^2 + 366559^2 .

It is a cyclic number.

It is not a de Polignac number, because 206326782017 - 2²⁰ = 206325733441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206326782007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516180228 + ... + 2516180309.

It is an arithmetic number, because the mean of its divisors is an integer number (52839785649).

Almost surely, 2^206326782017 is an apocalyptic number.

It is an amenable number.

206326782017 is a deficient number, since it is larger than the sum of its proper divisors (5032360579).

206326782017 is an equidigital number, since it uses as much as digits as its factorization.

206326782017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032360578.

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 206326782017 in words is "two hundred six billion, three hundred twenty-six million, seven hundred eighty-two thousand, seventeen".