6563664377 has 2 divisors, whose sum is σ = 6563664378. Its totient is φ = 6563664376.

The previous prime is 6563664343. The next prime is 6563664421. The reversal of 6563664377 is 7734663656.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5177665936 + 1385998441 = 71956^2 + 37229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6563664377 is a prime.

It is not a weakly prime, because it can be changed into another prime (6563664977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3281832188 + 3281832189.

It is an arithmetic number, because the mean of its divisors is an integer number (3281832189).

Almost surely, 2^6563664377 is an apocalyptic number.

It is an amenable number.

6563664377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6563664377 is an equidigital number, since it uses as much as digits as its factorization.

6563664377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 53.

The square root of 6563664377 is about 81016.4451022137. The cubic root of 6563664377 is about 1872.3288187741.

The spelling of 6563664377 in words is "six billion, five hundred sixty-three million, six hundred sixty-four thousand, three hundred seventy-seven".