81334653175189 has 2 divisors, whose sum is σ = 81334653175190. Its totient is φ = 81334653175188.

The previous prime is 81334653175147. The next prime is 81334653175211. The reversal of 81334653175189 is 98157135643318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57702512711089 + 23632140464100 = 7596217^2 + 4861290^2 .

It is a cyclic number.

It is not a de Polignac number, because 81334653175189 - 2²³ = 81334644786581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81334653175189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81334653170189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40667326587594 + 40667326587595.

It is an arithmetic number, because the mean of its divisors is an integer number (40667326587595).

Almost surely, 2^{81334653175189} is an apocalyptic number.

It is an amenable number.

81334653175189 is a deficient number, since it is larger than the sum of its proper divisors (1).

81334653175189 is an equidigital number, since it uses as much as digits as its factorization.

81334653175189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65318400, while the sum is 64.

The spelling of 81334653175189 in words is "eighty-one trillion, three hundred thirty-four billion, six hundred fifty-three million, one hundred seventy-five thousand, one hundred eighty-nine".