8064181681 has 2 divisors, whose sum is σ = 8064181682. Its totient is φ = 8064181680.

The previous prime is 8064181673. The next prime is 8064181711. The reversal of 8064181681 is 1861814608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4905741681 + 3158440000 = 70041^2 + 56200^2 .

It is a cyclic number.

It is not a de Polignac number, because 8064181681 - 2³ = 8064181673 is a prime.

It is a super-2 number, since 2×8064181681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8064181661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4032090840 + 4032090841.

It is an arithmetic number, because the mean of its divisors is an integer number (4032090841).

Almost surely, 2^8064181681 is an apocalyptic number.

It is an amenable number.

8064181681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8064181681 is an equidigital number, since it uses as much as digits as its factorization.

8064181681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 8064181681 is about 89800.7888662455. The cubic root of 8064181681 is about 2005.3342337435.

The spelling of 8064181681 in words is "eight billion, sixty-four million, one hundred eighty-one thousand, six hundred eighty-one".