66611712 has 80 divisors (see below), whose sum is σ = 187970112. Its totient is φ = 20889600.

The previous prime is 66611711. The next prime is 66611717. The reversal of 66611712 is 21711666.

It is a self number, because there is not a number n which added to its sum of digits gives 66611712.

It is not an unprimeable number, because it can be changed into a prime (66611711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24837 + ... + 27387.

Almost surely, 2^66611712 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 66611712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93985056).

66611712 is an abundant number, since it is smaller than the sum of its proper divisors (121358400).

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

66611712 is a wasteful number, since it uses less digits than its factorization.

66611712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2573 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 66611712 is about 8161.5998431680. The cubic root of 66611712 is about 405.3686872825.

The spelling of 66611712 in words is "sixty-six million, six hundred eleven thousand, seven hundred twelve".