66613412 has 24 divisors (see below), whose sum is σ = 123682104. Its totient is φ = 31283712.

The previous prime is 66613409. The next prime is 66613423. The reversal of 66613412 is 21431666.

It is a happy number.

66613412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12208036 + 54405376 = 3494^2 + 7376^2 .

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 7 ways as a sum of consecutive naturals, for example, 59078 + ... + 60194.

It is an arithmetic number, because the mean of its divisors is an integer number (5153421).

Almost surely, 2^66613412 is an apocalyptic number.

It is an amenable number.

66613412 is a deficient number, since it is larger than the sum of its proper divisors (57068692).

66613412 is a wasteful number, since it uses less digits than its factorization.

66613412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 2013 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 66613412 is about 8161.7039887514. The cubic root of 66613412 is about 405.3721357297.

The spelling of 66613412 in words is "sixty-six million, six hundred thirteen thousand, four hundred twelve".