6463391917 has 2 divisors, whose sum is σ = 6463391918. Its totient is φ = 6463391916.

The previous prime is 6463391833. The next prime is 6463391929. The reversal of 6463391917 is 7191933646.

It is a happy number.

6463391917 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6037134601 + 426257316 = 77699^2 + 20646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6463391917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6463391117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231695958 + 3231695959.

It is an arithmetic number, because the mean of its divisors is an integer number (3231695959).

Almost surely, 2^6463391917 is an apocalyptic number.

It is an amenable number.

6463391917 is a deficient number, since it is larger than the sum of its proper divisors (1).

6463391917 is an equidigital number, since it uses as much as digits as its factorization.

6463391917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 6463391917 is about 80395.2232225273. The cubic root of 6463391917 is about 1862.7453885770.

The spelling of 6463391917 in words is "six billion, four hundred sixty-three million, three hundred ninety-one thousand, nine hundred seventeen".