81163742063069 has 2 divisors, whose sum is σ = 81163742063070. Its totient is φ = 81163742063068.

The previous prime is 81163742063029. The next prime is 81163742063101. The reversal of 81163742063069 is 96036024736118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46409297878969 + 34754444184100 = 6812437^2 + 5895290^2 .

It is a cyclic number.

It is not a de Polignac number, because 81163742063069 - 2⁸ = 81163742062813 is a prime.

It is a super-2 number, since 2×81163742063069² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81163742063029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40581871031534 + 40581871031535.

It is an arithmetic number, because the mean of its divisors is an integer number (40581871031535).

Almost surely, 2^{81163742063069} is an apocalyptic number.

It is an amenable number.

81163742063069 is a deficient number, since it is larger than the sum of its proper divisors (1).

81163742063069 is an equidigital number, since it uses as much as digits as its factorization.

81163742063069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 56.

The spelling of 81163742063069 in words is "eighty-one trillion, one hundred sixty-three billion, seven hundred forty-two million, sixty-three thousand, sixty-nine".