6688161 has 6 divisors (see below), whose sum is σ = 9660690. Its totient is φ = 4458768.

The previous prime is 6688153. The next prime is 6688211. The reversal of 6688161 is 1618866.

It can be written as a sum of positive squares in only one way, i.e., 6471936 + 216225 = 2544^2 + 465^2 .

It is not a de Polignac number, because 6688161 - 2³ = 6688153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6688111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371556 + ... + 371573.

It is an arithmetic number, because the mean of its divisors is an integer number (1610115).

Almost surely, 2^6688161 is an apocalyptic number.

It is an amenable number.

6688161 is a deficient number, since it is larger than the sum of its proper divisors (2972529).

6688161 is a wasteful number, since it uses less digits than its factorization.

6688161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743135 (or 743132 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 6688161 is about 2586.1479076031. The cubic root of 6688161 is about 188.4092582033.

The spelling of 6688161 in words is "six million, six hundred eighty-eight thousand, one hundred sixty-one".