66401412 has 144 divisors (see below), whose sum is σ = 200202240. Its totient is φ = 16758720.

The previous prime is 66401407. The next prime is 66401429. The reversal of 66401412 is 21410466.

66401412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 477639 + ... + 477777.

Almost surely, 2^66401412 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 66401412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100101120).

66401412 is an abundant number, since it is smaller than the sum of its proper divisors (133800828).

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

66401412 is a wasteful number, since it uses less digits than its factorization.

66401412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 66401412 is about 8148.7061549672. The cubic root of 66401412 is about 404.9416407299.

Adding to 66401412 its reverse (21410466), we get a palindrome (87811878).

The spelling of 66401412 in words is "sixty-six million, four hundred one thousand, four hundred twelve".