9666819663 has 8 divisors (see below), whose sum is σ = 13009552128. Its totient is φ = 6384316824.

The previous prime is 9666819647. The next prime is 9666819691. The reversal of 9666819663 is 3669186669.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9666819663 - 2⁴ = 9666819647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9666819597 and 9666819606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666819263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15057031 + ... + 15057672.

It is an arithmetic number, because the mean of its divisors is an integer number (1626194016).

Almost surely, 2^9666819663 is an apocalyptic number.

9666819663 is a deficient number, since it is larger than the sum of its proper divisors (3342732465).

9666819663 is a wasteful number, since it uses less digits than its factorization.

9666819663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30114813.

The product of its digits is 15116544, while the sum is 60.

The square root of 9666819663 is about 98319.9860811626. The cubic root of 9666819663 is about 2130.2367479138.

The spelling of 9666819663 in words is "nine billion, six hundred sixty-six million, eight hundred nineteen thousand, six hundred sixty-three".