66223544 has 8 divisors (see below), whose sum is σ = 124169160. Its totient is φ = 33111768.

The previous prime is 66223543. The next prime is 66223571. The reversal of 66223544 is 44532266.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66223544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223543) by changing a digit.

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 as a sum of consecutive naturals, namely, 4138964 + ... + 4138979.

It is an arithmetic number, because the mean of its divisors is an integer number (15521145).

Almost surely, 2^66223544 is an apocalyptic number.

It is an amenable number.

66223544 is a deficient number, since it is larger than the sum of its proper divisors (57945616).

66223544 is a wasteful number, since it uses less digits than its factorization.

66223544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8277949 (or 8277945 counting only the distinct ones).

The product of its digits is 34560, while the sum is 32.

The square root of 66223544 is about 8137.7849566083. The cubic root of 66223544 is about 404.5797479875.

The spelling of 66223544 in words is "sixty-six million, two hundred twenty-three thousand, five hundred forty-four".