66685738 has 8 divisors (see below), whose sum is σ = 114318432. Its totient is φ = 28579596.

The previous prime is 66685699. The next prime is 66685739. The reversal of 66685738 is 83758666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66685691 and 66685700.

It is not an unprimeable number, because it can be changed into a prime (66685739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2381620 + ... + 2381647.

It is an arithmetic number, because the mean of its divisors is an integer number (14289804).

Almost surely, 2^66685738 is an apocalyptic number.

66685738 is a deficient number, since it is larger than the sum of its proper divisors (47632694).

66685738 is a wasteful number, since it uses less digits than its factorization.

66685738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763276.

The product of its digits is 1451520, while the sum is 49.

The square root of 66685738 is about 8166.1336016502. The cubic root of 66685738 is about 405.5187945857.

The spelling of 66685738 in words is "sixty-six million, six hundred eighty-five thousand, seven hundred thirty-eight".