66401212 has 12 divisors (see below), whose sum is σ = 116300800. Its totient is φ = 33172416.

The previous prime is 66401191. The next prime is 66401227. The reversal of 66401212 is 21210466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212 + ... + 11587.

Almost surely, 2^66401212 is an apocalyptic number.

It is an amenable number.

66401212 is a deficient number, since it is larger than the sum of its proper divisors (49899588).

66401212 is a wasteful number, since it uses less digits than its factorization.

66401212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100 (or 14098 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 66401212 is about 8148.6938830711. The cubic root of 66401212 is about 404.9412341702.

Adding to 66401212 its reverse (21210466), we get a palindrome (87611678).

The spelling of 66401212 in words is "sixty-six million, four hundred one thousand, two hundred twelve".