6641533709 has 2 divisors, whose sum is σ = 6641533710. Its totient is φ = 6641533708.

The previous prime is 6641533699. The next prime is 6641533747. The reversal of 6641533709 is 9073351466.

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., 6592952809 + 48580900 = 81197^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 6641533709 - 2²⁰ = 6640485133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6641533709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641533109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320766854 + 3320766855.

It is an arithmetic number, because the mean of its divisors is an integer number (3320766855).

Almost surely, 2^6641533709 is an apocalyptic number.

It is an amenable number.

6641533709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641533709 is an equidigital number, since it uses as much as digits as its factorization.

6641533709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 6641533709 is about 81495.6054582086. The cubic root of 6641533709 is about 1879.7039775536.

The spelling of 6641533709 in words is "six billion, six hundred forty-one million, five hundred thirty-three thousand, seven hundred nine".