206962185809 has 2 divisors, whose sum is σ = 206962185810. Its totient is φ = 206962185808.

The previous prime is 206962185803. The next prime is 206962185817. The reversal of 206962185809 is 908581269602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196844843584 + 10117342225 = 443672^2 + 100585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206962185809 is a prime.

It is not a weakly prime, because it can be changed into another prime (206962185803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103481092904 + 103481092905.

It is an arithmetic number, because the mean of its divisors is an integer number (103481092905).

Almost surely, 2^206962185809 is an apocalyptic number.

It is an amenable number.

206962185809 is a deficient number, since it is larger than the sum of its proper divisors (1).

206962185809 is an equidigital number, since it uses as much as digits as its factorization.

206962185809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 206962185809 in words is "two hundred six billion, nine hundred sixty-two million, one hundred eighty-five thousand, eight hundred nine".