6563965 has 8 divisors (see below), whose sum is σ = 7921368. Its totient is φ = 5221440.

The previous prime is 6563957. The next prime is 6563981. The reversal of 6563965 is 5693656.

It can be written as a sum of positive squares in 4 ways, for example, as 66564 + 6497401 = 258^2 + 2549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6563965 - 2³ = 6563957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2722 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (990171).

Almost surely, 2^6563965 is an apocalyptic number.

It is an amenable number.

6563965 is a deficient number, since it is larger than the sum of its proper divisors (1357403).

6563965 is a wasteful number, since it uses less digits than its factorization.

6563965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439.

The product of its digits is 145800, while the sum is 40.

The square root of 6563965 is about 2562.0236142550. The cubic root of 6563965 is about 187.2357403240.

The spelling of 6563965 in words is "six million, five hundred sixty-three thousand, nine hundred sixty-five".