6400005005 has 8 divisors (see below), whose sum is σ = 7736065272. Its totient is φ = 5082631168.

The previous prime is 6400004981. The next prime is 6400005019. The reversal of 6400005005 is 5005000046.

It can be written as a sum of positive squares in 4 ways, for example, as 47596201 + 6352408804 = 6899^2 + 79702^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400005005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4670852 + ... + 4672221.

It is an arithmetic number, because the mean of its divisors is an integer number (967008159).

Almost surely, 2^6400005005 is an apocalyptic number.

It is an amenable number.

6400005005 is a deficient number, since it is larger than the sum of its proper divisors (1336060267).

6400005005 is a wasteful number, since it uses less digits than its factorization.

6400005005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9343215.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 6400005005 is about 80000.0312812439. The cubic root of 6400005005 is about 1856.6360174273.

The spelling of 6400005005 in words is "six billion, four hundred million, five thousand, five".