205680253 has 2 divisors, whose sum is σ = 205680254. Its totient is φ = 205680252.

The previous prime is 205680239. The next prime is 205680281. The reversal of 205680253 is 352086502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141086884 + 64593369 = 11878^2 + 8037^2 .

It is a cyclic number.

It is not a de Polignac number, because 205680253 - 2⁹ = 205679741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205680953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102840126 + 102840127.

It is an arithmetic number, because the mean of its divisors is an integer number (102840127).

Almost surely, 2^205680253 is an apocalyptic number.

It is an amenable number.

205680253 is a deficient number, since it is larger than the sum of its proper divisors (1).

205680253 is an equidigital number, since it uses as much as digits as its factorization.

205680253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 205680253 is about 14341.5568541215. The cubic root of 205680253 is about 590.2883326877.

The spelling of 205680253 in words is "two hundred five million, six hundred eighty thousand, two hundred fifty-three".