6688657 has 2 divisors, whose sum is σ = 6688658. Its totient is φ = 6688656.

The previous prime is 6688651. The next prime is 6688663. The reversal of 6688657 is 7568866.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (6688651) and next prime (6688663).

It can be written as a sum of positive squares in only one way, i.e., 5363856 + 1324801 = 2316^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688657 - 2¹⁵ = 6655889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6688651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344328 + 3344329.

It is an arithmetic number, because the mean of its divisors is an integer number (3344329).

Almost surely, 2^6688657 is an apocalyptic number.

It is an amenable number.

6688657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688657 is an equidigital number, since it uses as much as digits as its factorization.

6688657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The square root of 6688657 is about 2586.2438013459. The cubic root of 6688657 is about 188.4139156211.

The spelling of 6688657 in words is "six million, six hundred eighty-eight thousand, six hundred fifty-seven".