12066581 has 4 divisors (see below), whose sum is σ = 12482700. Its totient is φ = 11650464.

The previous prime is 12066557. The next prime is 12066611. The reversal of 12066581 is 18566021.

It is a happy number.

12066581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10297681 + 1768900 = 3209^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 12066581 - 2⁶ = 12066517 is a prime.

It is a super-2 number, since 2×12066581² = 291204754059122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 416089 = 12066581 / (1 + 2 + 0 + 6 + 6 + 5 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12066511) 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, 208016 + ... + 208073.

It is an arithmetic number, because the mean of its divisors is an integer number (3120675).

Almost surely, 2^12066581 is an apocalyptic number.

It is an amenable number.

12066581 is a deficient number, since it is larger than the sum of its proper divisors (416119).

12066581 is an equidigital number, since it uses as much as digits as its factorization.

12066581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416118.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12066581 is about 3473.6984612945. The cubic root of 12066581 is about 229.3654912446.

The spelling of 12066581 in words is "twelve million, sixty-six thousand, five hundred eighty-one".