636245563 has 2 divisors, whose sum is σ = 636245564. Its totient is φ = 636245562.

The previous prime is 636245551. The next prime is 636245567. The reversal of 636245563 is 365542636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636245563 - 2⁵ = 636245531 is a prime.

It is not a weakly prime, because it can be changed into another prime (636245567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318122781 + 318122782.

It is an arithmetic number, because the mean of its divisors is an integer number (318122782).

Almost surely, 2^636245563 is an apocalyptic number.

636245563 is a deficient number, since it is larger than the sum of its proper divisors (1).

636245563 is an equidigital number, since it uses as much as digits as its factorization.

636245563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 40.

The square root of 636245563 is about 25223.9085591429. The cubic root of 636245563 is about 860.0854264338.

The spelling of 636245563 in words is "six hundred thirty-six million, two hundred forty-five thousand, five hundred sixty-three".