6685559 has 4 divisors (see below), whose sum is σ = 6777216. Its totient is φ = 6593904.

The previous prime is 6685543. The next prime is 6685577. The reversal of 6685559 is 9555866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9555866 = 2 ⋅4777933.

It is a cyclic number.

It is not a de Polignac number, because 6685559 - 2⁴ = 6685543 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 (6685519) 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, 45719 + ... + 45864.

It is an arithmetic number, because the mean of its divisors is an integer number (1694304).

Almost surely, 2^6685559 is an apocalyptic number.

6685559 is a deficient number, since it is larger than the sum of its proper divisors (91657).

6685559 is an equidigital number, since it uses as much as digits as its factorization.

6685559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91656.

The product of its digits is 324000, while the sum is 44.

The square root of 6685559 is about 2585.6447938570. The cubic root of 6685559 is about 188.3848217661.

The spelling of 6685559 in words is "six million, six hundred eighty-five thousand, five hundred fifty-nine".