80805525305581 has 2 divisors, whose sum is σ = 80805525305582. Its totient is φ = 80805525305580.

The previous prime is 80805525305543. The next prime is 80805525305627. The reversal of 80805525305581 is 18550352550808.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51456663288900 + 29348862016681 = 7173330^2 + 5417459^2 .

It is a cyclic number.

It is not a de Polignac number, because 80805525305581 - 2³⁹ = 80255769491693 is a prime.

It is a super-2 number, since 2×80805525305581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80805525300581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40402762652790 + 40402762652791.

It is an arithmetic number, because the mean of its divisors is an integer number (40402762652791).

Almost surely, 2^{80805525305581} is an apocalyptic number.

It is an amenable number.

80805525305581 is a deficient number, since it is larger than the sum of its proper divisors (1).

80805525305581 is an equidigital number, since it uses as much as digits as its factorization.

80805525305581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600000, while the sum is 55.

The spelling of 80805525305581 in words is "eighty trillion, eight hundred five billion, five hundred twenty-five million, three hundred five thousand, five hundred eighty-one".