1665633 has 8 divisors (see below), whose sum is σ = 2268288. Its totient is φ = 1086704.

The previous prime is 1665623. The next prime is 1665647. The reversal of 1665633 is 3365661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665633 - 2⁶ = 1665569 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665633.

It is not an unprimeable number, because it can be changed into a prime (1665623) 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, 5766 + ... + 6047.

It is an arithmetic number, because the mean of its divisors is an integer number (283536).

2^1665633 is an apocalyptic number.

It is an amenable number.

1665633 is a deficient number, since it is larger than the sum of its proper divisors (602655).

1665633 is a wasteful number, since it uses less digits than its factorization.

1665633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11863.

The product of its digits is 9720, while the sum is 30.

The square root of 1665633 is about 1290.5940492657. The cubic root of 1665633 is about 118.5385941337.

The spelling of 1665633 in words is "one million, six hundred sixty-five thousand, six hundred thirty-three".