8115815466181 has 2 divisors, whose sum is σ = 8115815466182. Its totient is φ = 8115815466180.

The previous prime is 8115815466169. The next prime is 8115815466293. The reversal of 8115815466181 is 1816645185118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5331619540900 + 2784195925281 = 2309030^2 + 1668591^2 .

It is a cyclic number.

It is not a de Polignac number, because 8115815466181 - 2⁵ = 8115815466149 is a prime.

It is a super-2 number, since 2×8115815466181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8115815461181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057907733090 + 4057907733091.

It is an arithmetic number, because the mean of its divisors is an integer number (4057907733091).

Almost surely, 2^{8115815466181} is an apocalyptic number.

It is an amenable number.

8115815466181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115815466181 is an equidigital number, since it uses as much as digits as its factorization.

8115815466181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843200, while the sum is 55.

The spelling of 8115815466181 in words is "eight trillion, one hundred fifteen billion, eight hundred fifteen million, four hundred sixty-six thousand, one hundred eighty-one".