6640018829 has 2 divisors, whose sum is σ = 6640018830. Its totient is φ = 6640018828.

The previous prime is 6640018813. The next prime is 6640018897. The reversal of 6640018829 is 9288100466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3430796329 + 3209222500 = 58573^2 + 56650^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640018829 - 2⁴ = 6640018813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6640018829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640018129) 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, 3320009414 + 3320009415.

It is an arithmetic number, because the mean of its divisors is an integer number (3320009415).

Almost surely, 2^6640018829 is an apocalyptic number.

It is an amenable number.

6640018829 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640018829 is an equidigital number, since it uses as much as digits as its factorization.

6640018829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 6640018829 is about 81486.3106846788. The cubic root of 6640018829 is about 1879.5610516065.

The spelling of 6640018829 in words is "six billion, six hundred forty million, eighteen thousand, eight hundred twenty-nine".