647964563 has 2 divisors, whose sum is σ = 647964564. Its totient is φ = 647964562.

The previous prime is 647964553. The next prime is 647964599. The reversal of 647964563 is 365469746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647964563 - 2⁸ = 647964307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (647964553) 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, 323982281 + 323982282.

It is an arithmetic number, because the mean of its divisors is an integer number (323982282).

Almost surely, 2^647964563 is an apocalyptic number.

647964563 is a deficient number, since it is larger than the sum of its proper divisors (1).

647964563 is an equidigital number, since it uses as much as digits as its factorization.

647964563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 50.

The square root of 647964563 is about 25455.1480647825. The cubic root of 647964563 is about 865.3339675148. Note that the first 3 decimals are identical.

The spelling of 647964563 in words is "six hundred forty-seven million, nine hundred sixty-four thousand, five hundred sixty-three".