206138934997 has 2 divisors, whose sum is σ = 206138934998. Its totient is φ = 206138934996.

The previous prime is 206138934977. The next prime is 206138935043. The reversal of 206138934997 is 799439831602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173823120241 + 32315814756 = 416921^2 + 179766^2 .

It is a cyclic number.

It is not a de Polignac number, because 206138934997 - 2¹¹ = 206138932949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206138934977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103069467498 + 103069467499.

It is an arithmetic number, because the mean of its divisors is an integer number (103069467499).

Almost surely, 2^206138934997 is an apocalyptic number.

It is an amenable number.

206138934997 is a deficient number, since it is larger than the sum of its proper divisors (1).

206138934997 is an equidigital number, since it uses as much as digits as its factorization.

206138934997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 206138934997 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-four thousand, nine hundred ninety-seven".