66567444 has 48 divisors (see below), whose sum is σ = 165626496. Its totient is φ = 20736000.

The previous prime is 66567419. The next prime is 66567481. The reversal of 66567444 is 44476566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66567396 and 66567405.

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 15 ways as a sum of consecutive naturals, for example, 29724 + ... + 31884.

It is an arithmetic number, because the mean of its divisors is an integer number (3450552).

Almost surely, 2^66567444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66567444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82813248).

66567444 is an abundant number, since it is smaller than the sum of its proper divisors (99059052).

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

66567444 is a wasteful number, since it uses less digits than its factorization.

66567444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336 (or 2334 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The square root of 66567444 is about 8158.8874241529. The cubic root of 66567444 is about 405.2788690550.

The spelling of 66567444 in words is "sixty-six million, five hundred sixty-seven thousand, four hundred forty-four".