66235216 has 40 divisors (see below), whose sum is σ = 140973120. Its totient is φ = 30007296.

The previous prime is 66235207. The next prime is 66235219. The reversal of 66235216 is 61253266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66235219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2256 + ... + 11728.

It is an arithmetic number, because the mean of its divisors is an integer number (3524328).

Almost surely, 2^66235216 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 66235216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70486560).

66235216 is an abundant number, since it is smaller than the sum of its proper divisors (74737904).

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

66235216 is a wasteful number, since it uses less digits than its factorization.

66235216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9523 (or 9517 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 66235216 is about 8138.5020734776. The cubic root of 66235216 is about 404.6035158558.

The spelling of 66235216 in words is "sixty-six million, two hundred thirty-five thousand, two hundred sixteen".