8518378181 has 2 divisors, whose sum is σ = 8518378182. Its totient is φ = 8518378180.

The previous prime is 8518378171. The next prime is 8518378213. The reversal of 8518378181 is 1818738158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7620417025 + 897961156 = 87295^2 + 29966^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518378181 - 2²² = 8514183877 is a prime.

It is a super-2 number, since 2×8518378181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8518378151) 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, 4259189090 + 4259189091.

It is an arithmetic number, because the mean of its divisors is an integer number (4259189091).

Almost surely, 2^8518378181 is an apocalyptic number.

It is an amenable number.

8518378181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8518378181 is an equidigital number, since it uses as much as digits as its factorization.

8518378181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 50.

The square root of 8518378181 is about 92295.0604366236. The cubic root of 8518378181 is about 2042.2973430756.

The spelling of 8518378181 in words is "eight billion, five hundred eighteen million, three hundred seventy-eight thousand, one hundred eighty-one".