6640445417 has 2 divisors, whose sum is σ = 6640445418. Its totient is φ = 6640445416.

The previous prime is 6640445411. The next prime is 6640445443. The reversal of 6640445417 is 7145440466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6457086736 + 183358681 = 80356^2 + 13541^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640445417 - 2¹² = 6640441321 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640445411) by changing a digit.

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 as a sum of consecutive naturals, namely, 3320222708 + 3320222709.

It is an arithmetic number, because the mean of its divisors is an integer number (3320222709).

Almost surely, 2^6640445417 is an apocalyptic number.

It is an amenable number.

6640445417 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640445417 is an equidigital number, since it uses as much as digits as its factorization.

6640445417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 41.

The square root of 6640445417 is about 81488.9281865948. The cubic root of 6640445417 is about 1879.6013015435.

The spelling of 6640445417 in words is "six billion, six hundred forty million, four hundred forty-five thousand, four hundred seventeen".