66938606 has 12 divisors (see below), whose sum is σ = 116801208. Its totient is φ = 28687932.

The previous prime is 66938603. The next prime is 66938623. The reversal of 66938606 is 60683966.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 341426 + ... + 341621.

It is an arithmetic number, because the mean of its divisors is an integer number (9733434).

Almost surely, 2^66938606 is an apocalyptic number.

66938606 is a deficient number, since it is larger than the sum of its proper divisors (49862602).

66938606 is a wasteful number, since it uses less digits than its factorization.

66938606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683063 (or 683056 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66938606 is about 8181.6016769334. The cubic root of 66938606 is about 406.0307150762.

The spelling of 66938606 in words is "sixty-six million, nine hundred thirty-eight thousand, six hundred six".