6640442273 has 2 divisors, whose sum is σ = 6640442274. Its totient is φ = 6640442272.

The previous prime is 6640442251. The next prime is 6640442317. The reversal of 6640442273 is 3722440466.

6640442273 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5787101329 + 853340944 = 76073^2 + 29212^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640442273 - 2¹⁴ = 6640425889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640442173) 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 as a sum of consecutive naturals, namely, 3320221136 + 3320221137.

It is an arithmetic number, because the mean of its divisors is an integer number (3320221137).

Almost surely, 2^6640442273 is an apocalyptic number.

It is an amenable number.

6640442273 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640442273 is an equidigital number, since it uses as much as digits as its factorization.

6640442273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 38.

The square root of 6640442273 is about 81488.9088956282. The cubic root of 6640442273 is about 1879.6010049034.

The spelling of 6640442273 in words is "six billion, six hundred forty million, four hundred forty-two thousand, two hundred seventy-three".