66643226 has 12 divisors (see below), whose sum is σ = 107721726. Its totient is φ = 30739200.

The previous prime is 66643201. The next prime is 66643229. The reversal of 66643226 is 62234666.

It can be written as a sum of positive squares in 3 ways, for example, as 65205625 + 1437601 = 8075^2 + 1199^2 .

It is not an unprimeable number, because it can be changed into a prime (66643229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40826 + ... + 42426.

Almost surely, 2^66643226 is an apocalyptic number.

66643226 is a deficient number, since it is larger than the sum of its proper divisors (41078500).

66643226 is an equidigital number, since it uses as much as digits as its factorization.

66643226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 1616 counting only the distinct ones).

The product of its digits is 62208, while the sum is 35.

The square root of 66643226 is about 8163.5302412620. The cubic root of 66643226 is about 405.4326038440.

The spelling of 66643226 in words is "sixty-six million, six hundred forty-three thousand, two hundred twenty-six".