206620243397 has 2 divisors, whose sum is σ = 206620243398. Its totient is φ = 206620243396.

The previous prime is 206620243381. The next prime is 206620243451. The reversal of 206620243397 is 793342026602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155550571201 + 51069672196 = 394399^2 + 225986^2 .

It is a cyclic number.

It is not a de Polignac number, because 206620243397 - 2⁴ = 206620243381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206620243307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103310121698 + 103310121699.

It is an arithmetic number, because the mean of its divisors is an integer number (103310121699).

Almost surely, 2^206620243397 is an apocalyptic number.

It is an amenable number.

206620243397 is a deficient number, since it is larger than the sum of its proper divisors (1).

206620243397 is an equidigital number, since it uses as much as digits as its factorization.

206620243397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 44.

Adding to 206620243397 its reverse (793342026602), we get a palindrome (999962269999).

The spelling of 206620243397 in words is "two hundred six billion, six hundred twenty million, two hundred forty-three thousand, three hundred ninety-seven".