6705386806681 has 8 divisors (see below), whose sum is σ = 6720880617224. Its totient is φ = 6689896583040.

The previous prime is 6705386806673. The next prime is 6705386806739. The reversal of 6705386806681 is 1866086835076.

It can be written as a sum of positive squares in 4 ways, for example, as 1507971720025 + 5197415086656 = 1227995^2 + 2279784^2 .

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 6705386806681 - 2³ = 6705386806673 is a prime.

It is a super-2 number, since 2×6705386806681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6705386806621) 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, 2864611 + ... + 4649383.

It is an arithmetic number, because the mean of its divisors is an integer number (840110077153).

Almost surely, 2^{6705386806681} is an apocalyptic number.

It is an amenable number.

6705386806681 is a deficient number, since it is larger than the sum of its proper divisors (15493810543).

6705386806681 is a wasteful number, since it uses less digits than its factorization.

6705386806681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793451.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 6705386806681 in words is "six trillion, seven hundred five billion, three hundred eighty-six million, eight hundred six thousand, six hundred eighty-one".