6685517 has 2 divisors, whose sum is σ = 6685518. Its totient is φ = 6685516.

The previous prime is 6685507. The next prime is 6685519. The reversal of 6685517 is 7155866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6482116 + 203401 = 2546^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 6685517 - 2¹⁰ = 6684493 is a prime.

It is a super-2 number, since 2×6685517² = 89392275114578, which contains 22 as substring.

Together with 6685519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6685519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342758 + 3342759.

It is an arithmetic number, because the mean of its divisors is an integer number (3342759).

Almost surely, 2^6685517 is an apocalyptic number.

It is an amenable number.

6685517 is a deficient number, since it is larger than the sum of its proper divisors (1).

6685517 is an equidigital number, since it uses as much as digits as its factorization.

6685517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 6685517 is about 2585.6366720790. The cubic root of 6685517 is about 188.3844272750.

The spelling of 6685517 in words is "six million, six hundred eighty-five thousand, five hundred seventeen".