66216052 has 18 divisors (see below), whose sum is σ = 134797362. Its totient is φ = 28378224.

The previous prime is 66216041. The next prime is 66216053. The reversal of 66216052 is 25061266.

66216052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41654116 + 24561936 = 6454^2 + 4956^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 66216052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66216053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168723 + ... + 169114.

Almost surely, 2^66216052 is an apocalyptic number.

It is an amenable number.

66216052 is an abundant number, since it is smaller than the sum of its proper divisors (68581310).

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

66216052 is a wasteful number, since it uses less digits than its factorization.

66216052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337855 (or 337846 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66216052 is about 8137.3246217661. The cubic root of 66216052 is about 404.5644904441.

The spelling of 66216052 in words is "sixty-six million, two hundred sixteen thousand, fifty-two".