6688168757 has 8 divisors (see below), whose sum is σ = 6737077656. Its totient is φ = 6639340032.

The previous prime is 6688168741. The next prime is 6688168759. The reversal of 6688168757 is 7578618866.

It can be written as a sum of positive squares in 4 ways, for example, as 1999396 + 6686169361 = 1414^2 + 81769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6688168757 - 2⁴ = 6688168741 is a prime.

It is a super-2 number, since 2×6688168757² = 89463202644221850098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6688168757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688168759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152813 + ... + 191645.

It is an arithmetic number, because the mean of its divisors is an integer number (842134707).

Almost surely, 2^6688168757 is an apocalyptic number.

It is an amenable number.

6688168757 is a deficient number, since it is larger than the sum of its proper divisors (48908899).

6688168757 is a wasteful number, since it uses less digits than its factorization.

6688168757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40087.

The product of its digits is 27095040, while the sum is 62.

The square root of 6688168757 is about 81781.2249663699. The cubic root of 6688168757 is about 1884.0933104292.

The spelling of 6688168757 in words is "six billion, six hundred eighty-eight million, one hundred sixty-eight thousand, seven hundred fifty-seven".