66616212 has 48 divisors (see below), whose sum is σ = 168920640. Its totient is φ = 20310528.

The previous prime is 66616201. The next prime is 66616259. The reversal of 66616212 is 21261666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66616212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15739 + ... + 19517.

It is an arithmetic number, because the mean of its divisors is an integer number (3519180).

Almost surely, 2^66616212 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 66616212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84460320).

66616212 is an abundant number, since it is smaller than the sum of its proper divisors (102304428).

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

66616212 is a wasteful number, since it uses less digits than its factorization.

66616212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912 (or 3910 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 66616212 is about 8161.8755197565. The cubic root of 66616212 is about 405.3778153971.

Adding to 66616212 its reverse (21261666), we get a palindrome (87877878).

The spelling of 66616212 in words is "sixty-six million, six hundred sixteen thousand, two hundred twelve".