6666985 has 16 divisors (see below), whose sum is σ = 8704080. Its totient is φ = 4872960.

The previous prime is 6666977. The next prime is 6666991. The reversal of 6666985 is 5896666.

It can be written as a sum of positive squares in 8 ways, for example, as 72361 + 6594624 = 269^2 + 2568^2 .

It is not a de Polignac number, because 6666985 - 2³ = 6666977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6615 + ... + 7555.

It is an arithmetic number, because the mean of its divisors is an integer number (544005).

Almost surely, 2^6666985 is an apocalyptic number.

6666985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6666985 is a deficient number, since it is larger than the sum of its proper divisors (2037095).

6666985 is a wasteful number, since it uses less digits than its factorization.

6666985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its digits is 466560, while the sum is 46.

The square root of 6666985 is about 2582.0505417207. The cubic root of 6666985 is about 188.2102013599.

The spelling of 6666985 in words is "six million, six hundred sixty-six thousand, nine hundred eighty-five".