5609666 has 4 divisors (see below), whose sum is σ = 8414502. Its totient is φ = 2804832.

The previous prime is 5609663. The next prime is 5609683. The reversal of 5609666 is 6669065.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4084441 + 1525225 = 2021^2 + 1235^2 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5609663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402415 + ... + 1402418.

Almost surely, 2^5609666 is an apocalyptic number.

5609666 is a deficient number, since it is larger than the sum of its proper divisors (2804836).

5609666 is a wasteful number, since it uses less digits than its factorization.

5609666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804835.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 5609666 is about 2368.4733479607. The cubic root of 5609666 is about 177.6829140011.

The spelling of 5609666 in words is "five million, six hundred nine thousand, six hundred sixty-six".