80559531817 has 2 divisors, whose sum is σ = 80559531818. Its totient is φ = 80559531816.

The previous prime is 80559531799. The next prime is 80559531853. The reversal of 80559531817 is 71813595508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76962411241 + 3597120576 = 277421^2 + 59976^2 .

It is a cyclic number.

It is not a de Polignac number, because 80559531817 - 2²³ = 80551143209 is a prime.

It is not a weakly prime, because it can be changed into another prime (80559535817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40279765908 + 40279765909.

It is an arithmetic number, because the mean of its divisors is an integer number (40279765909).

Almost surely, 2^80559531817 is an apocalyptic number.

It is an amenable number.

80559531817 is a deficient number, since it is larger than the sum of its proper divisors (1).

80559531817 is an equidigital number, since it uses as much as digits as its factorization.

80559531817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512000, while the sum is 52.

The spelling of 80559531817 in words is "eighty billion, five hundred fifty-nine million, five hundred thirty-one thousand, eight hundred seventeen".