206664659939 has 2 divisors, whose sum is σ = 206664659940. Its totient is φ = 206664659938.

The previous prime is 206664659933. The next prime is 206664660119. The reversal of 206664659939 is 939956466602.

206664659939 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-206664659939 is a prime.

It is a super-2 number, since 2×206664659939² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206664659933) 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, 103332329969 + 103332329970.

It is an arithmetic number, because the mean of its divisors is an integer number (103332329970).

Almost surely, 2^206664659939 is an apocalyptic number.

206664659939 is a deficient number, since it is larger than the sum of its proper divisors (1).

206664659939 is an equidigital number, since it uses as much as digits as its factorization.

206664659939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113374080, while the sum is 65.

The spelling of 206664659939 in words is "two hundred six billion, six hundred sixty-four million, six hundred fifty-nine thousand, nine hundred thirty-nine".