9661756880 has 160 divisors (see below), whose sum is σ = 25359091200. Its totient is φ = 3401588736.

The previous prime is 9661756873. The next prime is 9661756891. The reversal of 9661756880 is 886571669.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2038994 + ... + 2043726.

It is an arithmetic number, because the mean of its divisors is an integer number (158494320).

Almost surely, 2^9661756880 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 9661756880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12679545600).

9661756880 is an abundant number, since it is smaller than the sum of its proper divisors (15697334320).

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

9661756880 is a wasteful number, since it uses less digits than its factorization.

9661756880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861 (or 4855 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 56.

The square root of 9661756880 is about 98294.2362501485. The cubic root of 9661756880 is about 2129.8647948445.

The spelling of 9661756880 in words is "nine billion, six hundred sixty-one million, seven hundred fifty-six thousand, eight hundred eighty".