66608138 has 8 divisors (see below), whose sum is σ = 104256288. Its totient is φ = 31856044.

The previous prime is 66608131. The next prime is 66608141. The reversal of 66608138 is 83180666.

66608138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (66608131) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 723956 + ... + 724047.

It is an arithmetic number, because the mean of its divisors is an integer number (13032036).

Almost surely, 2^66608138 is an apocalyptic number.

66608138 is a deficient number, since it is larger than the sum of its proper divisors (37648150).

66608138 is a wasteful number, since it uses less digits than its factorization.

66608138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448028.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 66608138 is about 8161.3808880605. The cubic root of 66608138 is about 405.3614372382.

The spelling of 66608138 in words is "sixty-six million, six hundred eight thousand, one hundred thirty-eight".