9915663 has 16 divisors (see below), whose sum is σ = 14113280. Its totient is φ = 6174144.

The previous prime is 9915623. The next prime is 9915673. The reversal of 9915663 is 3665199.

It is not a de Polignac number, because 9915663 - 2⁸ = 9915407 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9915623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2970 + ... + 5352.

It is an arithmetic number, because the mean of its divisors is an integer number (882080).

Almost surely, 2^9915663 is an apocalyptic number.

9915663 is a deficient number, since it is larger than the sum of its proper divisors (4197617).

9915663 is a wasteful number, since it uses less digits than its factorization.

9915663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478.

The product of its digits is 43740, while the sum is 39.

The square root of 9915663 is about 3148.9145748972. The cubic root of 9915663 is about 214.8360964621.

The spelling of 9915663 in words is "nine million, nine hundred fifteen thousand, six hundred sixty-three".