6463578881 has 2 divisors, whose sum is σ = 6463578882. Its totient is φ = 6463578880.

The previous prime is 6463578871. The next prime is 6463578883. The reversal of 6463578881 is 1888753646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5326810225 + 1136768656 = 72985^2 + 33716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6463578881 is a prime.

It is a super-2 number, since 2×6463578881² = 83555703901818424322, which contains 22 as substring.

Together with 6463578883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6463578883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231789440 + 3231789441.

It is an arithmetic number, because the mean of its divisors is an integer number (3231789441).

Almost surely, 2^6463578881 is an apocalyptic number.

It is an amenable number.

6463578881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6463578881 is an equidigital number, since it uses as much as digits as its factorization.

6463578881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 56.

The square root of 6463578881 is about 80396.3859946453. The cubic root of 6463578881 is about 1862.7633493720.

The spelling of 6463578881 in words is "six billion, four hundred sixty-three million, five hundred seventy-eight thousand, eight hundred eighty-one".