6563491169 has 2 divisors, whose sum is σ = 6563491170. Its totient is φ = 6563491168.

The previous prime is 6563491111. The next prime is 6563491201. The reversal of 6563491169 is 9611943656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4288678144 + 2274813025 = 65488^2 + 47695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6563491169 is a prime.

It is a super-4 number, since 4×6563491169⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6563491369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3281745584 + 3281745585.

It is an arithmetic number, because the mean of its divisors is an integer number (3281745585).

Almost surely, 2^6563491169 is an apocalyptic number.

It is an amenable number.

6563491169 is a deficient number, since it is larger than the sum of its proper divisors (1).

6563491169 is an equidigital number, since it uses as much as digits as its factorization.

6563491169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 6563491169 is about 81015.3761270044. The cubic root of 6563491169 is about 1872.3123490521.

The spelling of 6563491169 in words is "six billion, five hundred sixty-three million, four hundred ninety-one thousand, one hundred sixty-nine".