66680608 has 12 divisors (see below), whose sum is σ = 131277510. Its totient is φ = 33340288.

The previous prime is 66680591. The next prime is 66680687. The reversal of 66680608 is 80608666.

It can be written as a sum of positive squares in only one way, i.e., 51093904 + 15586704 = 7148^2 + 3948^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1041853 + ... + 1041916.

Almost surely, 2^66680608 is an apocalyptic number.

It is an amenable number.

66680608 is a deficient number, since it is larger than the sum of its proper divisors (64596902).

66680608 is a wasteful number, since it uses less digits than its factorization.

66680608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083779 (or 2083771 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 66680608 is about 8165.8194934740. The cubic root of 66680608 is about 405.5083957367.

The spelling of 66680608 in words is "sixty-six million, six hundred eighty thousand, six hundred eight".