205787706253 has 2 divisors, whose sum is σ = 205787706254. Its totient is φ = 205787706252.

The previous prime is 205787706217. The next prime is 205787706269. The reversal of 205787706253 is 352607787502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205741166569 + 46539684 = 453587^2 + 6822^2 .

It is a cyclic number.

It is not a de Polignac number, because 205787706253 - 2¹⁷ = 205787575181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205787706253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205787706203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102893853126 + 102893853127.

It is an arithmetic number, because the mean of its divisors is an integer number (102893853127).

Almost surely, 2^205787706253 is an apocalyptic number.

It is an amenable number.

205787706253 is a deficient number, since it is larger than the sum of its proper divisors (1).

205787706253 is an equidigital number, since it uses as much as digits as its factorization.

205787706253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4939200, while the sum is 52.

The spelling of 205787706253 in words is "two hundred five billion, seven hundred eighty-seven million, seven hundred six thousand, two hundred fifty-three".