9947945663 has 4 divisors (see below), whose sum is σ = 10268847168. Its totient is φ = 9627044160.

The previous prime is 9947945647. The next prime is 9947945747. The reversal of 9947945663 is 3665497499.

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

It is a cyclic number.

It is not a de Polignac number, because 9947945663 - 2⁴ = 9947945647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9947945596 and 9947945605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947945633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160450706 + ... + 160450767.

It is an arithmetic number, because the mean of its divisors is an integer number (2567211792).

Almost surely, 2^9947945663 is an apocalyptic number.

9947945663 is a deficient number, since it is larger than the sum of its proper divisors (320901505).

9947945663 is a wasteful number, since it uses less digits than its factorization.

9947945663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320901504.

The product of its digits is 44089920, while the sum is 62.

The square root of 9947945663 is about 99739.3887238136. The cubic root of 9947945663 is about 2150.6899291478.

The spelling of 9947945663 in words is "nine billion, nine hundred forty-seven million, nine hundred forty-five thousand, six hundred sixty-three".