81259471780463 has 2 divisors, whose sum is σ = 81259471780464. Its totient is φ = 81259471780462.

The previous prime is 81259471780451. The next prime is 81259471780477. The reversal of 81259471780463 is 36408717495218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81259471780463 - 2²⁴ = 81259455003247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81259471780463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81259471788463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40629735890231 + 40629735890232.

It is an arithmetic number, because the mean of its divisors is an integer number (40629735890232).

It is a 1-persistent number, because it is pandigital, but 2⋅81259471780463 = 162518943560926 is not.

Almost surely, 2^{81259471780463} is an apocalyptic number.

81259471780463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81259471780463 is an equidigital number, since it uses as much as digits as its factorization.

81259471780463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 65.

The spelling of 81259471780463 in words is "eighty-one trillion, two hundred fifty-nine billion, four hundred seventy-one million, seven hundred eighty thousand, four hundred sixty-three".