66611338 has 16 divisors (see below), whose sum is σ = 106988040. Its totient is φ = 30992896.

The previous prime is 66611327. The next prime is 66611339. The reversal of 66611338 is 83311666.

It is a happy number.

66611338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 60326289 + 6285049 = 7767^2 + 2507^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (66611339) 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 in 7 ways as a sum of consecutive naturals, for example, 7981 + ... + 14032.

Almost surely, 2^66611338 is an apocalyptic number.

66611338 is a deficient number, since it is larger than the sum of its proper divisors (40376702).

66611338 is a wasteful number, since it uses less digits than its factorization.

66611338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22121.

The product of its digits is 15552, while the sum is 34.

The square root of 66611338 is about 8161.5769309613. The cubic root of 66611338 is about 405.3679286163.

The spelling of 66611338 in words is "sixty-six million, six hundred eleven thousand, three hundred thirty-eight".