206021344520653 has 2 divisors, whose sum is σ = 206021344520654. Its totient is φ = 206021344520652.

The previous prime is 206021344520591. The next prime is 206021344520681. The reversal of 206021344520653 is 356025443120602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141167024365129 + 64854320155524 = 11881373^2 + 8053218^2 .

It is a cyclic number.

It is not a de Polignac number, because 206021344520653 - 2⁹ = 206021344520141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206021344520353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103010672260326 + 103010672260327.

It is an arithmetic number, because the mean of its divisors is an integer number (103010672260327).

Almost surely, 2^{206021344520653} is an apocalyptic number.

It is an amenable number.

206021344520653 is a deficient number, since it is larger than the sum of its proper divisors (1).

206021344520653 is an equidigital number, since it uses as much as digits as its factorization.

206021344520653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 206021344520653 in words is "two hundred six trillion, twenty-one billion, three hundred forty-four million, five hundred twenty thousand, six hundred fifty-three".