647361563 has 2 divisors, whose sum is σ = 647361564. Its totient is φ = 647361562.

The previous prime is 647361389. The next prime is 647361643. The reversal of 647361563 is 365163746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647361563 - 2⁸ = 647361307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647361563.

It is not a weakly prime, because it can be changed into another prime (647361163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323680781 + 323680782.

It is an arithmetic number, because the mean of its divisors is an integer number (323680782).

Almost surely, 2^647361563 is an apocalyptic number.

647361563 is a deficient number, since it is larger than the sum of its proper divisors (1).

647361563 is an equidigital number, since it uses as much as digits as its factorization.

647361563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 41.

The square root of 647361563 is about 25443.3009454355. The cubic root of 647361563 is about 865.0654557482.

The spelling of 647361563 in words is "six hundred forty-seven million, three hundred sixty-one thousand, five hundred sixty-three".