66318012 has 72 divisors (see below), whose sum is σ = 175047600. Its totient is φ = 21143808.

The previous prime is 66317939. The next prime is 66318013. The reversal of 66318012 is 21081366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66318013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144888 + ... + 145344.

Almost surely, 2^66318012 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 66318012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87523800).

66318012 is an abundant number, since it is smaller than the sum of its proper divisors (108729588).

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

66318012 is a wasteful number, since it uses less digits than its factorization.

66318012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 66318012 is about 8143.5871702831. The cubic root of 66318012 is about 404.7720344874.

Adding to 66318012 its reverse (21081366), we get a palindrome (87399378).

The spelling of 66318012 in words is "sixty-six million, three hundred eighteen thousand, twelve".