81141164873 has 2 divisors, whose sum is σ = 81141164874. Its totient is φ = 81141164872.

The previous prime is 81141164857. The next prime is 81141164893. The reversal of 81141164873 is 37846114118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74356018489 + 6785146384 = 272683^2 + 82372^2 .

It is a cyclic number.

It is not a de Polignac number, because 81141164873 - 2⁴ = 81141164857 is a prime.

It is a super-2 number, since 2×81141164873² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81141164803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40570582436 + 40570582437.

It is an arithmetic number, because the mean of its divisors is an integer number (40570582437).

Almost surely, 2^81141164873 is an apocalyptic number.

It is an amenable number.

81141164873 is a deficient number, since it is larger than the sum of its proper divisors (1).

81141164873 is an equidigital number, since it uses as much as digits as its factorization.

81141164873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The spelling of 81141164873 in words is "eighty-one billion, one hundred forty-one million, one hundred sixty-four thousand, eight hundred seventy-three".