8505579503549 has 2 divisors, whose sum is σ = 8505579503550. Its totient is φ = 8505579503548.

The previous prime is 8505579503419. The next prime is 8505579503557. The reversal of 8505579503549 is 9453059755058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8503347602500 + 2231901049 = 2916050^2 + 47243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8505579503549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8505579503849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252789751774 + 4252789751775.

It is an arithmetic number, because the mean of its divisors is an integer number (4252789751775).

Almost surely, 2^{8505579503549} is an apocalyptic number.

It is an amenable number.

8505579503549 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505579503549 is an equidigital number, since it uses as much as digits as its factorization.

8505579503549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100000, while the sum is 65.

The spelling of 8505579503549 in words is "eight trillion, five hundred five billion, five hundred seventy-nine million, five hundred three thousand, five hundred forty-nine".