8663881641 has 4 divisors (see below), whose sum is σ = 11551842192. Its totient is φ = 5775921092.

The previous prime is 8663881621. The next prime is 8663881651. The reversal of 8663881641 is 1461883668.

8663881641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8663881641 - 2⁹ = 8663881129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8663881621) 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, 1443980271 + ... + 1443980276.

It is an arithmetic number, because the mean of its divisors is an integer number (2887960548).

Almost surely, 2^8663881641 is an apocalyptic number.

It is an amenable number.

8663881641 is a deficient number, since it is larger than the sum of its proper divisors (2887960551).

8663881641 is a wasteful number, since it uses less digits than its factorization.

8663881641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887960550.

The product of its digits is 1327104, while the sum is 51.

The square root of 8663881641 is about 93079.9744359655. The cubic root of 8663881641 is about 2053.8600000749.

The spelling of 8663881641 in words is "eight billion, six hundred sixty-three million, eight hundred eighty-one thousand, six hundred forty-one".