8155843117 has 2 divisors, whose sum is σ = 8155843118. Its totient is φ = 8155843116.

The previous prime is 8155843049. The next prime is 8155843121. The reversal of 8155843117 is 7113485518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8154270601 + 1572516 = 90301^2 + 1254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8155843117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8155843147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4077921558 + 4077921559.

It is an arithmetic number, because the mean of its divisors is an integer number (4077921559).

Almost surely, 2^8155843117 is an apocalyptic number.

It is an amenable number.

8155843117 is a deficient number, since it is larger than the sum of its proper divisors (1).

8155843117 is an equidigital number, since it uses as much as digits as its factorization.

8155843117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The square root of 8155843117 is about 90309.7066599156. The cubic root of 8155843117 is about 2012.9034972596.

The spelling of 8155843117 in words is "eight billion, one hundred fifty-five million, eight hundred forty-three thousand, one hundred seventeen".