6855757709 has 4 divisors (see below), whose sum is σ = 6859073340. Its totient is φ = 6852442080.

The previous prime is 6855757691. The next prime is 6855757747. The reversal of 6855757709 is 9077575586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3377353225 + 3478404484 = 58115^2 + 58978^2 .

It is a cyclic number.

It is not a de Polignac number, because 6855757709 - 2³² = 2560790413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855757759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654712 + ... + 1658849.

It is an arithmetic number, because the mean of its divisors is an integer number (1714768335).

Almost surely, 2^6855757709 is an apocalyptic number.

It is an amenable number.

6855757709 is a deficient number, since it is larger than the sum of its proper divisors (3315631).

6855757709 is a wasteful number, since it uses less digits than its factorization.

6855757709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315630.

The product of its (nonzero) digits is 18522000, while the sum is 59.

The square root of 6855757709 is about 82799.5030721803. The cubic root of 6855757709 is about 1899.7005722975.

The spelling of 6855757709 in words is "six billion, eight hundred fifty-five million, seven hundred fifty-seven thousand, seven hundred nine".