9945661 has 8 divisors (see below), whose sum is σ = 10972800. Its totient is φ = 8939040.

The previous prime is 9945647. The next prime is 9945667. The reversal of 9945661 is 1665499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9945661 - 2⁹ = 9945149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101 + ... + 6058.

It is an arithmetic number, because the mean of its divisors is an integer number (1371600).

Almost surely, 2^9945661 is an apocalyptic number.

It is an amenable number.

9945661 is a deficient number, since it is larger than the sum of its proper divisors (1027139).

9945661 is a wasteful number, since it uses less digits than its factorization.

9945661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10259.

The product of its digits is 58320, while the sum is 40.

The square root of 9945661 is about 3153.6742063821. The cubic root of 9945661 is about 215.0525272776.

The spelling of 9945661 in words is "nine million, nine hundred forty-five thousand, six hundred sixty-one".