20013065615729 has 2 divisors, whose sum is σ = 20013065615730. Its totient is φ = 20013065615728.

The previous prime is 20013065615687. The next prime is 20013065615761. The reversal of 20013065615729 is 92751656031002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10341755539600 + 9671310076129 = 3215860^2 + 3109873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013065615729 is a prime.

It is not a weakly prime, because it can be changed into another prime (20013065615029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006532807864 + 10006532807865.

It is an arithmetic number, because the mean of its divisors is an integer number (10006532807865).

Almost surely, 2^{20013065615729} is an apocalyptic number.

It is an amenable number.

20013065615729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013065615729 is an equidigital number, since it uses as much as digits as its factorization.

20013065615729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 20013065615729 in words is "twenty trillion, thirteen billion, sixty-five million, six hundred fifteen thousand, seven hundred twenty-nine".