6687535489 has 2 divisors, whose sum is σ = 6687535490. Its totient is φ = 6687535488.

The previous prime is 6687535433. The next prime is 6687535501. The reversal of 6687535489 is 9845357866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5956752400 + 730783089 = 77180^2 + 27033^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687535489 - 2⁹ = 6687534977 is a prime.

It is not a weakly prime, because it can be changed into another prime (6687535409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343767744 + 3343767745.

It is an arithmetic number, because the mean of its divisors is an integer number (3343767745).

Almost surely, 2^6687535489 is an apocalyptic number.

It is an amenable number.

6687535489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687535489 is an equidigital number, since it uses as much as digits as its factorization.

6687535489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43545600, while the sum is 61.

The square root of 6687535489 is about 81777.3531547702. The cubic root of 6687535489 is about 1884.0338435454.

The spelling of 6687535489 in words is "six billion, six hundred eighty-seven million, five hundred thirty-five thousand, four hundred eighty-nine".