5645665 has 4 divisors (see below), whose sum is σ = 6774804. Its totient is φ = 4516528.

The previous prime is 5645657. The next prime is 5645671. The reversal of 5645665 is 5665465.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1993744 + 3651921 = 1412^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645665 - 2³ = 5645657 is a prime.

It is a Duffinian number.

5645665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564562 + ... + 564571.

It is an arithmetic number, because the mean of its divisors is an integer number (1693701).

Almost surely, 2^5645665 is an apocalyptic number.

It is an amenable number.

5645665 is a deficient number, since it is larger than the sum of its proper divisors (1129139).

5645665 is a wasteful number, since it uses less digits than its factorization.

5645665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129138.

The product of its digits is 108000, while the sum is 37.

The square root of 5645665 is about 2376.0608157200. The cubic root of 5645665 is about 178.0621863265.

The spelling of 5645665 in words is "five million, six hundred forty-five thousand, six hundred sixty-five".