9666540660 has 144 divisors (see below), whose sum is σ = 31929448320. Its totient is φ = 2178328320.

The previous prime is 9666540647. The next prime is 9666540661. The reversal of 9666540660 is 660456669.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666540661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185586 + ... + 231894.

It is an arithmetic number, because the mean of its divisors is an integer number (221732280).

Almost surely, 2^9666540660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9666540660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15964724160).

9666540660 is an abundant number, since it is smaller than the sum of its proper divisors (22262907660).

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

9666540660 is a wasteful number, since it uses less digits than its factorization.

9666540660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46406 (or 46397 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The square root of 9666540660 is about 98318.5672190151. The cubic root of 9666540660 is about 2130.2162534740.

The spelling of 9666540660 in words is "nine billion, six hundred sixty-six million, five hundred forty thousand, six hundred sixty".