206602988257 has 2 divisors, whose sum is σ = 206602988258. Its totient is φ = 206602988256.

The previous prime is 206602988227. The next prime is 206602988281. The reversal of 206602988257 is 752889206602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188283095056 + 18319893201 = 433916^2 + 135351^2 .

It is a cyclic number.

It is not a de Polignac number, because 206602988257 - 2⁷ = 206602988129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206602988198 and 206602988207.

It is not a weakly prime, because it can be changed into another prime (206602988227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103301494128 + 103301494129.

It is an arithmetic number, because the mean of its divisors is an integer number (103301494129).

Almost surely, 2^206602988257 is an apocalyptic number.

It is an amenable number.

206602988257 is a deficient number, since it is larger than the sum of its proper divisors (1).

206602988257 is an equidigital number, since it uses as much as digits as its factorization.

206602988257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 206602988257 in words is "two hundred six billion, six hundred two million, nine hundred eighty-eight thousand, two hundred fifty-seven".