8689555681 has 2 divisors, whose sum is σ = 8689555682. Its totient is φ = 8689555680.

The previous prime is 8689555669. The next prime is 8689555711. The reversal of 8689555681 is 1865559868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5222230225 + 3467325456 = 72265^2 + 58884^2 .

It is a cyclic number.

It is not a de Polignac number, because 8689555681 - 2⁹ = 8689555169 is a prime.

It is a super-2 number, since 2×8689555681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8689555601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4344777840 + 4344777841.

It is an arithmetic number, because the mean of its divisors is an integer number (4344777841).

Almost surely, 2^8689555681 is an apocalyptic number.

It is an amenable number.

8689555681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8689555681 is an equidigital number, since it uses as much as digits as its factorization.

8689555681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736000, while the sum is 61.

The square root of 8689555681 is about 93217.7862910292. The cubic root of 8689555681 is about 2055.8867622515.

The spelling of 8689555681 in words is "eight billion, six hundred eighty-nine million, five hundred fifty-five thousand, six hundred eighty-one".