6638510689 has 2 divisors, whose sum is σ = 6638510690. Its totient is φ = 6638510688.

The previous prime is 6638510653. The next prime is 6638510759. The reversal of 6638510689 is 9860158366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4904621089 + 1733889600 = 70033^2 + 41640^2 .

It is a cyclic number.

It is not a de Polignac number, because 6638510689 - 2¹⁹ = 6637986401 is a prime.

It is not a weakly prime, because it can be changed into another prime (6638510609) 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, 3319255344 + 3319255345.

It is an arithmetic number, because the mean of its divisors is an integer number (3319255345).

Almost surely, 2^6638510689 is an apocalyptic number.

It is an amenable number.

6638510689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638510689 is an equidigital number, since it uses as much as digits as its factorization.

6638510689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 6638510689 is about 81477.0562121632. The cubic root of 6638510689 is about 1879.4187399698.

The spelling of 6638510689 in words is "six billion, six hundred thirty-eight million, five hundred ten thousand, six hundred eighty-nine".