6400664109 has 12 divisors (see below), whose sum is σ = 10566175776. Its totient is φ = 3657522312.

The previous prime is 6400664107. The next prime is 6400664113. The reversal of 6400664109 is 9014660046.

6400664109 is a `hidden beast` number, since 6 + 4 + 0 + 0 + 6 + 641 + 0 + 9 = 666.

It is not a de Polignac number, because 6400664109 - 2¹ = 6400664107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400664107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50798859 + ... + 50798984.

It is an arithmetic number, because the mean of its divisors is an integer number (880514648).

Almost surely, 2^6400664109 is an apocalyptic number.

It is an amenable number.

6400664109 is a deficient number, since it is larger than the sum of its proper divisors (4165511667).

6400664109 is a wasteful number, since it uses less digits than its factorization.

6400664109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101597856 (or 101597853 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6400664109 is about 80004.1505735796. The cubic root of 6400664109 is about 1856.6997504098.

The spelling of 6400664109 in words is "six billion, four hundred million, six hundred sixty-four thousand, one hundred nine".