9966123573 has 24 divisors (see below), whose sum is σ = 15465081312. Its totient is φ = 5692194144.

The previous prime is 9966123553. The next prime is 9966123617. The reversal of 9966123573 is 3753216699.

It is a happy number.

9966123573 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9966123573 - 2⁶ = 9966123509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966123553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313686 + ... + 343992.

It is an arithmetic number, because the mean of its divisors is an integer number (644378388).

Almost surely, 2^9966123573 is an apocalyptic number.

It is an amenable number.

9966123573 is a deficient number, since it is larger than the sum of its proper divisors (5498957739).

9966123573 is a wasteful number, since it uses less digits than its factorization.

9966123573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32561 (or 32554 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 51.

The square root of 9966123573 is about 99830.4741699648. The cubic root of 9966123573 is about 2151.9991193601. Note that the first 3 decimals are identical.

The spelling of 9966123573 in words is "nine billion, nine hundred sixty-six million, one hundred twenty-three thousand, five hundred seventy-three".