6563997 has 40 divisors (see below), whose sum is σ = 10977120. Its totient is φ = 3875040.

The previous prime is 6563983. The next prime is 6564001. The reversal of 6563997 is 7993656.

6563997 is a `hidden beast` number, since 6 + 5 + 639 + 9 + 7 = 666.

It is not a de Polignac number, because 6563997 - 2⁴ = 6563981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6563957) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47154 + ... + 47292.

It is an arithmetic number, because the mean of its divisors is an integer number (274428).

Almost surely, 2^6563997 is an apocalyptic number.

It is an amenable number.

6563997 is a deficient number, since it is larger than the sum of its proper divisors (4413123).

6563997 is a wasteful number, since it uses less digits than its factorization.

6563997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 206 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 6563997 is about 2562.0298593108. The cubic root of 6563997 is about 187.2360445879.

The spelling of 6563997 in words is "six million, five hundred sixty-three thousand, nine hundred ninety-seven".