9665550 has 72 divisors (see below), whose sum is σ = 26578656. Its totient is φ = 2517120.

The previous prime is 9665527. The next prime is 9665567. The reversal of 9665550 is 555669.

9665550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20922 + ... + 21378.

It is an arithmetic number, because the mean of its divisors is an integer number (369148).

Almost surely, 2^9665550 is an apocalyptic number.

9665550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9665550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13289328).

9665550 is an abundant number, since it is smaller than the sum of its proper divisors (16913106).

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

9665550 is a wasteful number, since it uses less digits than its factorization.

9665550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 9665550 is about 3108.9467669936. The cubic root of 9665550 is about 213.0143480383.

The spelling of 9665550 in words is "nine million, six hundred sixty-five thousand, five hundred fifty".