6640603 has 4 divisors (see below), whose sum is σ = 6854848. Its totient is φ = 6426360.

The previous prime is 6640597. The next prime is 6640631. The reversal of 6640603 is 3060466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3060466 = 2 ⋅1530233.

It is a cyclic number.

It is not a de Polignac number, because 6640603 - 2⁹ = 6640091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107076 + ... + 107137.

It is an arithmetic number, because the mean of its divisors is an integer number (1713712).

Almost surely, 2^6640603 is an apocalyptic number.

6640603 is a deficient number, since it is larger than the sum of its proper divisors (214245).

6640603 is a wasteful number, since it uses less digits than its factorization.

6640603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214244.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6640603 is about 2576.9367473805. The cubic root of 6640603 is about 187.9616169566.

The spelling of 6640603 in words is "six million, six hundred forty thousand, six hundred three".