66811444 has 24 divisors (see below), whose sum is σ = 134371328. Its totient is φ = 28473120.

The previous prime is 66811439. The next prime is 66811457. The reversal of 66811444 is 44411866.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1524 + ... + 11659.

Almost surely, 2^66811444 is an apocalyptic number.

It is an amenable number.

66811444 is an abundant number, since it is smaller than the sum of its proper divisors (67559884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66811444 is a wasteful number, since it uses less digits than its factorization.

66811444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13375 (or 13373 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 66811444 is about 8173.8267659646. The cubic root of 66811444 is about 405.7734424797.

The spelling of 66811444 in words is "sixty-six million, eight hundred eleven thousand, four hundred forty-four".