6479640005 has 6 divisors (see below), whose sum is σ = 7775784006. Its totient is φ = 5183568008.

The previous prime is 6479640001. The next prime is 6479640023. The reversal of 6479640005 is 5000469746.

It can be written as a sum of positive squares in only one way, i.e., 5183712004 + 1295928001 = 71998^2 + 35999^2 .

It is not a de Polignac number, because 6479640005 - 2² = 6479640001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6479640001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161996 + ... + 197994.

It is an arithmetic number, because the mean of its divisors is an integer number (1295964001).

Almost surely, 2^6479640005 is an apocalyptic number.

It is an amenable number.

6479640005 is a deficient number, since it is larger than the sum of its proper divisors (1296144001).

6479640005 is an frugal number, since it uses more digits than its factorization.

6479640005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72003 (or 36004 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 6479640005 is about 80496.2111220149. The cubic root of 6479640005 is about 1864.3049786069.

The spelling of 6479640005 in words is "six billion, four hundred seventy-nine million, six hundred forty thousand, five".