8666961824441 has 2 divisors, whose sum is σ = 8666961824442. Its totient is φ = 8666961824440.

The previous prime is 8666961824401. The next prime is 8666961824449. The reversal of 8666961824441 is 1444281696668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8397123132841 + 269838691600 = 2897779^2 + 519460^2 .

It is a cyclic number.

It is not a de Polignac number, because 8666961824441 - 2⁶ = 8666961824377 is a prime.

It is not a weakly prime, because it can be changed into another prime (8666961824449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333480912220 + 4333480912221.

It is an arithmetic number, because the mean of its divisors is an integer number (4333480912221).

Almost surely, 2^{8666961824441} is an apocalyptic number.

It is an amenable number.

8666961824441 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666961824441 is an equidigital number, since it uses as much as digits as its factorization.

8666961824441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95551488, while the sum is 65.

The spelling of 8666961824441 in words is "eight trillion, six hundred sixty-six billion, nine hundred sixty-one million, eight hundred twenty-four thousand, four hundred forty-one".