81729257711063 has 2 divisors, whose sum is σ = 81729257711064. Its totient is φ = 81729257711062.

The previous prime is 81729257711009. The next prime is 81729257711111. The reversal of 81729257711063 is 36011775292718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81729257711063 - 2²⁸ = 81728989275607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81729257710993 and 81729257711011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81729257711663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40864628855531 + 40864628855532.

It is an arithmetic number, because the mean of its divisors is an integer number (40864628855532).

Almost surely, 2^{81729257711063} is an apocalyptic number.

81729257711063 is a deficient number, since it is larger than the sum of its proper divisors (1).

81729257711063 is an equidigital number, since it uses as much as digits as its factorization.

81729257711063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8890560, while the sum is 59.

The spelling of 81729257711063 in words is "eighty-one trillion, seven hundred twenty-nine billion, two hundred fifty-seven million, seven hundred eleven thousand, sixty-three".