647647163 has 2 divisors, whose sum is σ = 647647164. Its totient is φ = 647647162.

The previous prime is 647647109. The next prime is 647647171. The reversal of 647647163 is 361746746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647647163 - 2²⁴ = 630869947 is a prime.

It is not a weakly prime, because it can be changed into another prime (647647103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323823581 + 323823582.

It is an arithmetic number, because the mean of its divisors is an integer number (323823582).

Almost surely, 2^647647163 is an apocalyptic number.

647647163 is a deficient number, since it is larger than the sum of its proper divisors (1).

647647163 is an equidigital number, since it uses as much as digits as its factorization.

647647163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The square root of 647647163 is about 25448.9128058548. The cubic root of 647647163 is about 865.1926522457.

The spelling of 647647163 in words is "six hundred forty-seven million, six hundred forty-seven thousand, one hundred sixty-three".