9999642433566 has 64 divisors (see below), whose sum is σ = 21398074933248. Its totient is φ = 3104248063488.

The previous prime is 9999642433493. The next prime is 9999642433579. The reversal of 9999642433566 is 6653342469999.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 13043491 + ... + 13788833.

It is an arithmetic number, because the mean of its divisors is an integer number (334344920832).

Almost surely, 2^{9999642433566} is an apocalyptic number.

9999642433566 is an abundant number, since it is smaller than the sum of its proper divisors (11398432499682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999642433566 is a wasteful number, since it uses less digits than its factorization.

9999642433566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746745.

The product of its digits is 2040733440, while the sum is 75.

The spelling of 9999642433566 in words is "nine trillion, nine hundred ninety-nine billion, six hundred forty-two million, four hundred thirty-three thousand, five hundred sixty-six".