66822012 has 72 divisors (see below), whose sum is σ = 179029760. Its totient is φ = 20956320.

The previous prime is 66821999. The next prime is 66822047. The reversal of 66822012 is 21022866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144093 + ... + 144555.

Almost surely, 2^66822012 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 66822012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89514880).

66822012 is an abundant number, since it is smaller than the sum of its proper divisors (112207748).

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

66822012 is a wasteful number, since it uses less digits than its factorization.

66822012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66822012 is about 8174.4731940352. The cubic root of 66822012 is about 405.7948359586.

Adding to 66822012 its reverse (21022866), we get a palindrome (87844878).

The spelling of 66822012 in words is "sixty-six million, eight hundred twenty-two thousand, twelve".