9900555579663 has 24 divisors (see below), whose sum is σ = 15405983252352. Its totient is φ = 5639032095984.

The previous prime is 9900555579631. The next prime is 9900555579667. The reversal of 9900555579663 is 3669755550099.

It is not a de Polignac number, because 9900555579663 - 2⁵ = 9900555579631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900555579667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109646595 + ... + 109736852.

It is an arithmetic number, because the mean of its divisors is an integer number (641915968848).

Almost surely, 2^{9900555579663} is an apocalyptic number.

9900555579663 is a deficient number, since it is larger than the sum of its proper divisors (5505427672689).

9900555579663 is a wasteful number, since it uses less digits than its factorization.

9900555579663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219383771 (or 219383764 counting only the distinct ones).

The product of its (nonzero) digits is 344452500, while the sum is 69.

The spelling of 9900555579663 in words is "nine trillion, nine hundred billion, five hundred fifty-five million, five hundred seventy-nine thousand, six hundred sixty-three".