206975565977 has 2 divisors, whose sum is σ = 206975565978. Its totient is φ = 206975565976.

The previous prime is 206975565961. The next prime is 206975565989. The reversal of 206975565977 is 779565579602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205960761241 + 1014804736 = 453829^2 + 31856^2 .

It is a cyclic number.

It is not a de Polignac number, because 206975565977 - 2⁴ = 206975565961 is a prime.

It is a super-2 number, since 2×206975565977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206975567977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103487782988 + 103487782989.

It is an arithmetic number, because the mean of its divisors is an integer number (103487782989).

Almost surely, 2^206975565977 is an apocalyptic number.

It is an amenable number.

206975565977 is a deficient number, since it is larger than the sum of its proper divisors (1).

206975565977 is an equidigital number, since it uses as much as digits as its factorization.

206975565977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250047000, while the sum is 68.

The spelling of 206975565977 in words is "two hundred six billion, nine hundred seventy-five million, five hundred sixty-five thousand, nine hundred seventy-seven".