6687535409 has 2 divisors, whose sum is σ = 6687535410. Its totient is φ = 6687535408.

The previous prime is 6687535373. The next prime is 6687535427. The reversal of 6687535409 is 9045357866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6625960000 + 61575409 = 81400^2 + 7847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6687535409 is a prime.

It is not a weakly prime, because it can be changed into another prime (6687535489) 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, 3343767704 + 3343767705.

It is an arithmetic number, because the mean of its divisors is an integer number (3343767705).

Almost surely, 2^6687535409 is an apocalyptic number.

It is an amenable number.

6687535409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687535409 is an equidigital number, since it uses as much as digits as its factorization.

6687535409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The square root of 6687535409 is about 81777.3526656372. The cubic root of 6687535409 is about 1884.0338360328.

The spelling of 6687535409 in words is "six billion, six hundred eighty-seven million, five hundred thirty-five thousand, four hundred nine".