66649444 has 12 divisors (see below), whose sum is σ = 117727344. Its totient is φ = 33013064.

The previous prime is 66649439. The next prime is 66649459. The reversal of 66649444 is 44494666.

It is a self number, because there is not a number n which added to its sum of digits gives 66649444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77434 + ... + 78289.

It is an arithmetic number, because the mean of its divisors is an integer number (9810612).

Almost surely, 2^66649444 is an apocalyptic number.

It is an amenable number.

66649444 is a deficient number, since it is larger than the sum of its proper divisors (51077900).

66649444 is a wasteful number, since it uses less digits than its factorization.

66649444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155834 (or 155832 counting only the distinct ones).

The product of its digits is 497664, while the sum is 43.

The square root of 66649444 is about 8163.9110725191. The cubic root of 66649444 is about 405.4452127851.

The spelling of 66649444 in words is "sixty-six million, six hundred forty-nine thousand, four hundred forty-four".