8045218381 has 2 divisors, whose sum is σ = 8045218382. Its totient is φ = 8045218380.

The previous prime is 8045218351. The next prime is 8045218403. The reversal of 8045218381 is 1838125408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7932752356 + 112466025 = 89066^2 + 10605^2 .

It is a cyclic number.

It is not a de Polignac number, because 8045218381 - 2²⁷ = 7911000653 is a prime.

It is a super-2 number, since 2×8045218381² (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 (8045218351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4022609190 + 4022609191.

It is an arithmetic number, because the mean of its divisors is an integer number (4022609191).

Almost surely, 2^8045218381 is an apocalyptic number.

It is an amenable number.

8045218381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8045218381 is an equidigital number, since it uses as much as digits as its factorization.

8045218381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 8045218381 is about 89695.1413455601. The cubic root of 8045218381 is about 2003.7611209675.

The spelling of 8045218381 in words is "eight billion, forty-five million, two hundred eighteen thousand, three hundred eighty-one".