206744638439 has 2 divisors, whose sum is σ = 206744638440. Its totient is φ = 206744638438.

The previous prime is 206744638433. The next prime is 206744638469. The reversal of 206744638439 is 934836447602.

206744638439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206744638439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206744638433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103372319219 + 103372319220.

It is an arithmetic number, because the mean of its divisors is an integer number (103372319220).

Almost surely, 2^206744638439 is an apocalyptic number.

206744638439 is a deficient number, since it is larger than the sum of its proper divisors (1).

206744638439 is an equidigital number, since it uses as much as digits as its factorization.

206744638439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20901888, while the sum is 56.

The spelling of 206744638439 in words is "two hundred six billion, seven hundred forty-four million, six hundred thirty-eight thousand, four hundred thirty-nine".