9666821794560 has 288 divisors, whose sum is σ = 36003984038400. Its totient is φ = 2209558966272.

The previous prime is 9666821794543. The next prime is 9666821794613. The reversal of 9666821794560 is 654971286669.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2352562 + ... + 4986801.

Almost surely, 2^{9666821794560} is an apocalyptic number.

It is an amenable number.

9666821794560 is an abundant number, since it is smaller than the sum of its proper divisors (26337162243840).

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

9666821794560 is an equidigital number, since it uses as much as digits as its factorization.

9666821794560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339408 (or 7339380 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 69.

The spelling of 9666821794560 in words is "nine trillion, six hundred sixty-six billion, eight hundred twenty-one million, seven hundred ninety-four thousand, five hundred sixty".