5645666 has 32 divisors (see below), whose sum is σ = 9879408. Its totient is φ = 2396160.

The previous prime is 5645657. The next prime is 5645671. The reversal of 5645666 is 6665465.

It can be written as a sum of positive squares in 8 ways, for example, as 3916441 + 1729225 = 1979^2 + 1315^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23306 + ... + 23546.

Almost surely, 2^5645666 is an apocalyptic number.

5645666 is a deficient number, since it is larger than the sum of its proper divisors (4233742).

5645666 is a wasteful number, since it uses less digits than its factorization.

5645666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 129600, while the sum is 38.

The square root of 5645666 is about 2376.0610261523. The cubic root of 5645666 is about 178.0621968397.

The spelling of 5645666 in words is "five million, six hundred forty-five thousand, six hundred sixty-six".