9664163885 has 4 divisors (see below), whose sum is σ = 11596996668. Its totient is φ = 7731331104.

The previous prime is 9664163869. The next prime is 9664163917. The reversal of 9664163885 is 5883614669.

It is a happy number.

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 3450152644 + 6214011241 = 58738^2 + 78829^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664163885 - 2⁴ = 9664163869 is a prime.

It is a super-2 number, since 2×9664163885² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9664163885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966416384 + ... + 966416393.

It is an arithmetic number, because the mean of its divisors is an integer number (2899249167).

Almost surely, 2^9664163885 is an apocalyptic number.

It is an amenable number.

9664163885 is a deficient number, since it is larger than the sum of its proper divisors (1932832783).

9664163885 is a wasteful number, since it uses less digits than its factorization.

9664163885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932832782.

The product of its digits is 7464960, while the sum is 56.

The square root of 9664163885 is about 98306.4793642820. The cubic root of 9664163885 is about 2130.0416491375.

The spelling of 9664163885 in words is "nine billion, six hundred sixty-four million, one hundred sixty-three thousand, eight hundred eighty-five".