9900665 has 8 divisors (see below), whose sum is σ = 12105288. Its totient is φ = 7770880.

The previous prime is 9900661. The next prime is 9900677. The reversal of 9900665 is 5660099.

9900665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2572816 + 7327849 = 1604^2 + 2707^2 .

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

It is not a de Polignac number, because 9900665 - 2² = 9900661 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 (9900661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18416 + ... + 18945.

It is an arithmetic number, because the mean of its divisors is an integer number (1513161).

Almost surely, 2^9900665 is an apocalyptic number.

It is an amenable number.

9900665 is a deficient number, since it is larger than the sum of its proper divisors (2204623).

9900665 is a wasteful number, since it uses less digits than its factorization.

9900665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37419.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 9900665 is about 3146.5322181729. The cubic root of 9900665 is about 214.7277245633.

The spelling of 9900665 in words is "nine million, nine hundred thousand, six hundred sixty-five".