8661265289 has 2 divisors, whose sum is σ = 8661265290. Its totient is φ = 8661265288.

The previous prime is 8661265267. The next prime is 8661265307. The reversal of 8661265289 is 9825621668.

8661265289 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8553105289 + 108160000 = 92483^2 + 10400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8661265289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8661265289.

It is not a weakly prime, because it can be changed into another prime (8661265229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330632644 + 4330632645.

It is an arithmetic number, because the mean of its divisors is an integer number (4330632645).

Almost surely, 2^8661265289 is an apocalyptic number.

It is an amenable number.

8661265289 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661265289 is an equidigital number, since it uses as much as digits as its factorization.

8661265289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 53.

The square root of 8661265289 is about 93065.9190520354. The cubic root of 8661265289 is about 2053.6532351032.

The spelling of 8661265289 in words is "eight billion, six hundred sixty-one million, two hundred sixty-five thousand, two hundred eighty-nine".