66643332 has 144 divisors (see below), whose sum is σ = 196499520. Its totient is φ = 17461248.

The previous prime is 66643319. The next prime is 66643333. The reversal of 66643332 is 23334666.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66643293 and 66643302.

It is not an unprimeable number, because it can be changed into a prime (66643333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 589708 + ... + 589820.

It is an arithmetic number, because the mean of its divisors is an integer number (1364580).

Almost surely, 2^66643332 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 66643332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98249760).

66643332 is an abundant number, since it is smaller than the sum of its proper divisors (129856188).

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

66643332 is a wasteful number, since it uses less digits than its factorization.

66643332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 201 counting only the distinct ones).

The product of its digits is 46656, while the sum is 33.

The square root of 66643332 is about 8163.5367335488. The cubic root of 66643332 is about 405.4328187988.

Adding to 66643332 its reverse (23334666), we get a palindrome (89977998).

The spelling of 66643332 in words is "sixty-six million, six hundred forty-three thousand, three hundred thirty-two".