66994212 has 48 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 20746752.

The previous prime is 66994211. The next prime is 66994219. The reversal of 66994212 is 21249966.

It is not an unprimeable number, because it can be changed into a prime (66994211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14038 + ... + 18194.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^66994212 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 66994212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

66994212 is an abundant number, since it is smaller than the sum of its proper divisors (100656348).

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

66994212 is a wasteful number, since it uses less digits than its factorization.

66994212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260 (or 4258 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 66994212 is about 8184.9992058643. Note that the first 3 decimals coincide. The cubic root of 66994212 is about 406.1431140658.

The spelling of 66994212 in words is "sixty-six million, nine hundred ninety-four thousand, two hundred twelve".