805666105613 has 2 divisors, whose sum is σ = 805666105614. Its totient is φ = 805666105612.

The previous prime is 805666105591. The next prime is 805666105627. The reversal of 805666105613 is 316501666508.

805666105613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721961200489 + 83704905124 = 849683^2 + 289318^2 .

It is a cyclic number.

It is not a de Polignac number, because 805666105613 - 2³⁶ = 736946628877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805666101613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402833052806 + 402833052807.

It is an arithmetic number, because the mean of its divisors is an integer number (402833052807).

Almost surely, 2^805666105613 is an apocalyptic number.

It is an amenable number.

805666105613 is a deficient number, since it is larger than the sum of its proper divisors (1).

805666105613 is an equidigital number, since it uses as much as digits as its factorization.

805666105613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 805666105613 in words is "eight hundred five billion, six hundred sixty-six million, one hundred five thousand, six hundred thirteen".