6688705897 has 2 divisors, whose sum is σ = 6688705898. Its totient is φ = 6688705896.

The previous prime is 6688705889. The next prime is 6688705909. The reversal of 6688705897 is 7985078866.

6688705897 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5402838016 + 1285867881 = 73504^2 + 35859^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688705897 - 2³ = 6688705889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6688700897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344352948 + 3344352949.

It is an arithmetic number, because the mean of its divisors is an integer number (3344352949).

Almost surely, 2^6688705897 is an apocalyptic number.

It is an amenable number.

6688705897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688705897 is an equidigital number, since it uses as much as digits as its factorization.

6688705897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 64.

The square root of 6688705897 is about 81784.5089060269. The cubic root of 6688705897 is about 1884.1437474933.

The spelling of 6688705897 in words is "six billion, six hundred eighty-eight million, seven hundred five thousand, eight hundred ninety-seven".