8661966289 has 4 divisors (see below), whose sum is σ = 8896073524. Its totient is φ = 8427859056.

The previous prime is 8661966263. The next prime is 8661966301. The reversal of 8661966289 is 9826691668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8133334225 + 528632064 = 90185^2 + 22992^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661966289 - 2³¹ = 6514482641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8661936289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117053562 + ... + 117053635.

It is an arithmetic number, because the mean of its divisors is an integer number (2224018381).

Almost surely, 2^8661966289 is an apocalyptic number.

It is an amenable number.

8661966289 is a deficient number, since it is larger than the sum of its proper divisors (234107235).

8661966289 is a wasteful number, since it uses less digits than its factorization.

8661966289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234107234.

The product of its digits is 13436928, while the sum is 61.

The square root of 8661966289 is about 93069.6851235675. The cubic root of 8661966289 is about 2053.7086377892.

The spelling of 8661966289 in words is "eight billion, six hundred sixty-one million, nine hundred sixty-six thousand, two hundred eighty-nine".