206505116977 has 2 divisors, whose sum is σ = 206505116978. Its totient is φ = 206505116976.

The previous prime is 206505116969. The next prime is 206505117001. The reversal of 206505116977 is 779611505602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158396836081 + 48108280896 = 397991^2 + 219336^2 .

It is a cyclic number.

It is not a de Polignac number, because 206505116977 - 2³ = 206505116969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206505116977.

It is not a weakly prime, because it can be changed into another prime (206505116777) 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, 103252558488 + 103252558489.

It is an arithmetic number, because the mean of its divisors is an integer number (103252558489).

Almost surely, 2^206505116977 is an apocalyptic number.

It is an amenable number.

206505116977 is a deficient number, since it is larger than the sum of its proper divisors (1).

206505116977 is an equidigital number, since it uses as much as digits as its factorization.

206505116977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 206505116977 in words is "two hundred six billion, five hundred five million, one hundred sixteen thousand, nine hundred seventy-seven".