20565550193 has 2 divisors, whose sum is σ = 20565550194. Its totient is φ = 20565550192.

The previous prime is 20565550183. The next prime is 20565550289. The reversal of 20565550193 is 39105556502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16094220769 + 4471329424 = 126863^2 + 66868^2 .

It is a cyclic number.

It is not a de Polignac number, because 20565550193 - 2¹⁸ = 20565288049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20565550193.

It is not a weakly prime, because it can be changed into another prime (20565550183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282775096 + 10282775097.

It is an arithmetic number, because the mean of its divisors is an integer number (10282775097).

Almost surely, 2^20565550193 is an apocalyptic number.

It is an amenable number.

20565550193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20565550193 is an equidigital number, since it uses as much as digits as its factorization.

20565550193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 41.

The spelling of 20565550193 in words is "twenty billion, five hundred sixty-five million, five hundred fifty thousand, one hundred ninety-three".