206101777397 has 2 divisors, whose sum is σ = 206101777398. Its totient is φ = 206101777396.

The previous prime is 206101777381. The next prime is 206101777417. The reversal of 206101777397 is 793777101602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189224130001 + 16877647396 = 434999^2 + 129914^2 .

It is a cyclic number.

It is not a de Polignac number, because 206101777397 - 2⁴ = 206101777381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206101777307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103050888698 + 103050888699.

It is an arithmetic number, because the mean of its divisors is an integer number (103050888699).

Almost surely, 2^206101777397 is an apocalyptic number.

It is an amenable number.

206101777397 is a deficient number, since it is larger than the sum of its proper divisors (1).

206101777397 is an equidigital number, since it uses as much as digits as its factorization.

206101777397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777924, while the sum is 50.

Adding to 206101777397 its reverse (793777101602), we get a palindrome (999878878999).

The spelling of 206101777397 in words is "two hundred six billion, one hundred one million, seven hundred seventy-seven thousand, three hundred ninety-seven".