6606581 has 2 divisors, whose sum is σ = 6606582. Its totient is φ = 6606580.

The previous prime is 6606541. The next prime is 6606629. The reversal of 6606581 is 1856066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6604900 + 1681 = 2570^2 + 41^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6606581 is a prime.

It is a super-2 number, since 2×6606581² = 87293825019122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6606521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303290 + 3303291.

It is an arithmetic number, because the mean of its divisors is an integer number (3303291).

Almost surely, 2^6606581 is an apocalyptic number.

It is an amenable number.

6606581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606581 is an equidigital number, since it uses as much as digits as its factorization.

6606581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6606581 is about 2570.3270219955. The cubic root of 6606581 is about 187.6400707423.

The spelling of 6606581 in words is "six million, six hundred six thousand, five hundred eighty-one".