66613312 has 14 divisors (see below), whose sum is σ = 132185918. Its totient is φ = 33306624.

The previous prime is 66613307. The next prime is 66613367. The reversal of 66613312 is 21331666.

It can be written as a sum of positive squares in only one way, i.e., 57517056 + 9096256 = 7584^2 + 3016^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520353 + ... + 520480.

Almost surely, 2^66613312 is an apocalyptic number.

It is an amenable number.

66613312 is a deficient number, since it is larger than the sum of its proper divisors (65572606).

66613312 is a wasteful number, since it uses less digits than its factorization.

66613312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040845 (or 1040835 counting only the distinct ones).

The product of its digits is 3888, while the sum is 28.

The square root of 66613312 is about 8161.6978625774. The cubic root of 66613312 is about 405.3719328815.

Adding to 66613312 its reverse (21331666), we get a palindrome (87944978).

The spelling of 66613312 in words is "sixty-six million, six hundred thirteen thousand, three hundred twelve".