66689312 has 12 divisors (see below), whose sum is σ = 131294646. Its totient is φ = 33344640.

The previous prime is 66689309. The next prime is 66689327. The reversal of 66689312 is 21398666.

66689312 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 only one way, i.e., 66650896 + 38416 = 8164^2 + 196^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66689312.

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 as a sum of consecutive naturals, namely, 1041989 + ... + 1042052.

Almost surely, 2^66689312 is an apocalyptic number.

It is an amenable number.

66689312 is a deficient number, since it is larger than the sum of its proper divisors (64605334).

66689312 is a wasteful number, since it uses less digits than its factorization.

66689312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084051 (or 2084043 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 66689312 is about 8166.3524293285. The cubic root of 66689312 is about 405.5260390047.

The spelling of 66689312 in words is "sixty-six million, six hundred eighty-nine thousand, three hundred twelve".