27066581 has 2 divisors, whose sum is σ = 27066582. Its totient is φ = 27066580.

The previous prime is 27066577. The next prime is 27066629. The reversal of 27066581 is 18566072.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 7344100 = 4441^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 27066581 - 2² = 27066577 is a prime.

It is a super-2 number, since 2×27066581² = 1465199614059122, 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 (27066521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13533290 + 13533291.

It is an arithmetic number, because the mean of its divisors is an integer number (13533291).

Almost surely, 2^27066581 is an apocalyptic number.

It is an amenable number.

27066581 is a deficient number, since it is larger than the sum of its proper divisors (1).

27066581 is an equidigital number, since it uses as much as digits as its factorization.

27066581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 27066581 is about 5202.5552375732. Note that the first 3 decimals coincide. The cubic root of 27066581 is about 300.2463938744.

The spelling of 27066581 in words is "twenty-seven million, sixty-six thousand, five hundred eighty-one".