81259502180543 has 2 divisors, whose sum is σ = 81259502180544. Its totient is φ = 81259502180542.

The previous prime is 81259502180477. The next prime is 81259502180561. The reversal of 81259502180543 is 34508120595218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81259502180543 - 2¹⁶ = 81259502115007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81259502110543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40629751090271 + 40629751090272.

It is an arithmetic number, because the mean of its divisors is an integer number (40629751090272).

Almost surely, 2^{81259502180543} is an apocalyptic number.

81259502180543 is a deficient number, since it is larger than the sum of its proper divisors (1).

81259502180543 is an equidigital number, since it uses as much as digits as its factorization.

81259502180543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456000, while the sum is 53.

The spelling of 81259502180543 in words is "eighty-one trillion, two hundred fifty-nine billion, five hundred two million, one hundred eighty thousand, five hundred forty-three".