6685005857 has 2 divisors, whose sum is σ = 6685005858. Its totient is φ = 6685005856.

The previous prime is 6685005853. The next prime is 6685005883. The reversal of 6685005857 is 7585005866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6118994176 + 566011681 = 78224^2 + 23791^2 .

It is a cyclic number.

It is not a de Polignac number, because 6685005857 - 2² = 6685005853 is a prime.

It is not a weakly prime, because it can be changed into another prime (6685005853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342502928 + 3342502929.

It is an arithmetic number, because the mean of its divisors is an integer number (3342502929).

Almost surely, 2^6685005857 is an apocalyptic number.

It is an amenable number.

6685005857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6685005857 is an equidigital number, since it uses as much as digits as its factorization.

6685005857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The square root of 6685005857 is about 81761.8851115848. The cubic root of 6685005857 is about 1883.7962615865.

Subtracting 6685005857 from its reverse (7585005866), we obtain a palindrome (900000009).

The spelling of 6685005857 in words is "six billion, six hundred eighty-five million, five thousand, eight hundred fifty-seven".