6602640409 has 2 divisors, whose sum is σ = 6602640410. Its totient is φ = 6602640408.

The previous prime is 6602640403. The next prime is 6602640449. The reversal of 6602640409 is 9040462066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5318493184 + 1284147225 = 72928^2 + 35835^2 .

It is a cyclic number.

It is not a de Polignac number, because 6602640409 - 2²⁵ = 6569085977 is a prime.

It is not a weakly prime, because it can be changed into another prime (6602640403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3301320204 + 3301320205.

It is an arithmetic number, because the mean of its divisors is an integer number (3301320205).

Almost surely, 2^6602640409 is an apocalyptic number.

It is an amenable number.

6602640409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6602640409 is an equidigital number, since it uses as much as digits as its factorization.

6602640409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 6602640409 is about 81256.6330154037. The cubic root of 6602640409 is about 1876.0275644247.

The spelling of 6602640409 in words is "six billion, six hundred two million, six hundred forty thousand, four hundred nine".