6649563 has 16 divisors (see below), whose sum is σ = 9553280. Its totient is φ = 4100544.

The previous prime is 6649547. The next prime is 6649571. The reversal of 6649563 is 3659466.

It is a happy number.

It is not a de Polignac number, because 6649563 - 2⁴ = 6649547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6649583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (597080).

Almost surely, 2^6649563 is an apocalyptic number.

6649563 is a deficient number, since it is larger than the sum of its proper divisors (2903717).

6649563 is a wasteful number, since it uses less digits than its factorization.

6649563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778.

The product of its digits is 116640, while the sum is 39.

The square root of 6649563 is about 2578.6746595878. The cubic root of 6649563 is about 188.0461162709.

The spelling of 6649563 in words is "six million, six hundred forty-nine thousand, five hundred sixty-three".