81530376254897 has 2 divisors, whose sum is σ = 81530376254898. Its totient is φ = 81530376254896.

The previous prime is 81530376254881. The next prime is 81530376254933. The reversal of 81530376254897 is 79845267303518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45086444046736 + 36443932208161 = 6714644^2 + 6036881^2 .

It is a cyclic number.

It is not a de Polignac number, because 81530376254897 - 2⁴ = 81530376254881 is a prime.

It is not a weakly prime, because it can be changed into another prime (81530376254597) 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, 40765188127448 + 40765188127449.

It is an arithmetic number, because the mean of its divisors is an integer number (40765188127449).

It is a 1-persistent number, because it is pandigital, but 2⋅81530376254897 = 163060752509794 is not.

Almost surely, 2^{81530376254897} is an apocalyptic number.

It is an amenable number.

81530376254897 is a deficient number, since it is larger than the sum of its proper divisors (1).

81530376254897 is an equidigital number, since it uses as much as digits as its factorization.

81530376254897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 304819200, while the sum is 68.

The spelling of 81530376254897 in words is "eighty-one trillion, five hundred thirty billion, three hundred seventy-six million, two hundred fifty-four thousand, eight hundred ninety-seven".