9955663 has 4 divisors (see below), whose sum is σ = 9966888. Its totient is φ = 9944440.

The previous prime is 9955651. The next prime is 9955697. The reversal of 9955663 is 3665599.

It is a happy number.

9955663 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 an emirpimes, since its reverse is a distinct semiprime: 3665599 = 7 ⋅523657.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9955663 is a prime.

It is a Duffinian number.

9955663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9955633) 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, 4156 + ... + 6097.

It is an arithmetic number, because the mean of its divisors is an integer number (2491722).

Almost surely, 2^9955663 is an apocalyptic number.

9955663 is a deficient number, since it is larger than the sum of its proper divisors (11225).

9955663 is a wasteful number, since it uses less digits than its factorization.

9955663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224.

The product of its digits is 218700, while the sum is 43.

The square root of 9955663 is about 3155.2595772773. The cubic root of 9955663 is about 215.1245933687.

Subtracting from 9955663 its reverse (3665599), we obtain a square (6290064 = 2508²).

The spelling of 9955663 in words is "nine million, nine hundred fifty-five thousand, six hundred sixty-three".