8661945663 has 48 divisors (see below), whose sum is σ = 15078286080. Its totient is φ = 4680882432.

The previous prime is 8661945623. The next prime is 8661945667. The reversal of 8661945663 is 3665491668.

8661945663 is a `hidden beast` number, since 8 + 66 + 19 + 4 + 566 + 3 = 666.

It is not a de Polignac number, because 8661945663 - 2⁹ = 8661945151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661945667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 703720 + ... + 715922.

It is an arithmetic number, because the mean of its divisors is an integer number (314130960).

Almost surely, 2^8661945663 is an apocalyptic number.

8661945663 is a deficient number, since it is larger than the sum of its proper divisors (6416340417).

8661945663 is a wasteful number, since it uses less digits than its factorization.

8661945663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12828 (or 12825 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 8661945663 is about 93069.5743140582. The cubic root of 8661945663 is about 2053.7070076809.

The spelling of 8661945663 in words is "eight billion, six hundred sixty-one million, nine hundred forty-five thousand, six hundred sixty-three".