20565423677713 has 2 divisors, whose sum is σ = 20565423677714. Its totient is φ = 20565423677712.

The previous prime is 20565423677699. The next prime is 20565423677761. The reversal of 20565423677713 is 31777632456502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20524596646464 + 40827031249 = 4530408^2 + 202057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20565423677713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20565423671713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282711838856 + 10282711838857.

It is an arithmetic number, because the mean of its divisors is an integer number (10282711838857).

Almost surely, 2^{20565423677713} is an apocalyptic number.

It is an amenable number.

20565423677713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20565423677713 is an equidigital number, since it uses as much as digits as its factorization.

20565423677713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44452800, while the sum is 58.

The spelling of 20565423677713 in words is "twenty trillion, five hundred sixty-five billion, four hundred twenty-three million, six hundred seventy-seven thousand, seven hundred thirteen".