9665656560 has 160 divisors (see below), whose sum is σ = 38048993280. Its totient is φ = 2209289472.

The previous prime is 9665656547. The next prime is 9665656571. The reversal of 9665656560 is 656565669.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 9665656497 and 9665656506.

It is a congruent number.

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, 304512 + ... + 334751.

It is an arithmetic number, because the mean of its divisors is an integer number (237806208).

Almost surely, 2^9665656560 is an apocalyptic number.

9665656560 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9665656560 is an abundant number, since it is smaller than the sum of its proper divisors (28383336720).

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

9665656560 is a wasteful number, since it uses less digits than its factorization.

9665656560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639292 (or 639280 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 54.

The square root of 9665656560 is about 98314.0710173269. The cubic root of 9665656560 is about 2130.1513084340.

The spelling of 9665656560 in words is "nine billion, six hundred sixty-five million, six hundred fifty-six thousand, five hundred sixty".