6463812809 has 4 divisors (see below), whose sum is σ = 6465209616. Its totient is φ = 6462416004.

The previous prime is 6463812799. The next prime is 6463812833. The reversal of 6463812809 is 9082183646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6463812809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6463812899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691439 + ... + 700724.

It is an arithmetic number, because the mean of its divisors is an integer number (1616302404).

Almost surely, 2^6463812809 is an apocalyptic number.

It is an amenable number.

6463812809 is a deficient number, since it is larger than the sum of its proper divisors (1396807).

6463812809 is a wasteful number, since it uses less digits than its factorization.

6463812809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396806.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 6463812809 is about 80397.8408229972. The cubic root of 6463812809 is about 1862.7858213005.

The spelling of 6463812809 in words is "six billion, four hundred sixty-three million, eight hundred twelve thousand, eight hundred nine".