66420212 has 18 divisors (see below), whose sum is σ = 118776882. Its totient is φ = 32499184.

The previous prime is 66420187. The next prime is 66420223. The reversal of 66420212 is 21202466.

It can be written as a sum of positive squares in only one way, i.e., 65351056 + 1069156 = 8084^2 + 1034^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5078 + ... + 12594.

Almost surely, 2^66420212 is an apocalyptic number.

It is an amenable number.

66420212 is a deficient number, since it is larger than the sum of its proper divisors (52356670).

66420212 is a wasteful number, since it uses less digits than its factorization.

66420212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615 (or 7566 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66420212 is about 8149.8596306930. The cubic root of 66420212 is about 404.9798536948.

Adding to 66420212 its reverse (21202466), we get a palindrome (87622678).

The spelling of 66420212 in words is "sixty-six million, four hundred twenty thousand, two hundred twelve".