6662581 has 2 divisors, whose sum is σ = 6662582. Its totient is φ = 6662580.

The previous prime is 6662567. The next prime is 6662633. The reversal of 6662581 is 1852666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5244100 + 1418481 = 2290^2 + 1191^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662581 - 2⁹ = 6662069 is a prime.

It is a super-2 number, since 2×6662581² = 88779971163122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6662531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331290 + 3331291.

It is an arithmetic number, because the mean of its divisors is an integer number (3331291).

Almost surely, 2^6662581 is an apocalyptic number.

It is an amenable number.

6662581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662581 is an equidigital number, since it uses as much as digits as its factorization.

6662581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 6662581 is about 2581.1975902670. The cubic root of 6662581 is about 188.1687503240.

The spelling of 6662581 in words is "six million, six hundred sixty-two thousand, five hundred eighty-one".