9656599680 has 1280 divisors, whose sum is σ = 44786649600. Its totient is φ = 1926955008.

The previous prime is 9656599669. The next prime is 9656599723. The reversal of 9656599680 is 869956569.

9656599680 is a `hidden beast` number, since 9 + 6 + 565 + 9 + 9 + 68 + 0 = 666.

It is a super-2 number, since 2×9656599680² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 108501076 + ... + 108501164.

It is an arithmetic number, because the mean of its divisors is an integer number (34989570).

Almost surely, 2^9656599680 is an apocalyptic number.

9656599680 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9656599680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22393324800).

9656599680 is an abundant number, since it is smaller than the sum of its proper divisors (35130049920).

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

9656599680 is a wasteful number, since it uses less digits than its factorization.

9656599680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 31492800, while the sum is 63.

The square root of 9656599680 is about 98267.9992673098. Note that the first 3 decimals coincide. The cubic root of 9656599680 is about 2129.4857715196.

The spelling of 9656599680 in words is "nine billion, six hundred fifty-six million, five hundred ninety-nine thousand, six hundred eighty".