81163742063029 has 2 divisors, whose sum is σ = 81163742063030. Its totient is φ = 81163742063028.

The previous prime is 81163742062901. The next prime is 81163742063069. The reversal of 81163742063029 is 92036024736118.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71762466240529 + 9401275822500 = 8471273^2 + 3066150^2 .

It is a cyclic number.

It is not a de Polignac number, because 81163742063029 - 2⁷ = 81163742062901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81163742063069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40581871031514 + 40581871031515.

It is an arithmetic number, because the mean of its divisors is an integer number (40581871031515).

Almost surely, 2^{81163742063029} is an apocalyptic number.

It is an amenable number.

81163742063029 is a deficient number, since it is larger than the sum of its proper divisors (1).

81163742063029 is an equidigital number, since it uses as much as digits as its factorization.

81163742063029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 81163742063029 in words is "eighty-one trillion, one hundred sixty-three billion, seven hundred forty-two million, sixty-three thousand, twenty-nine".