66707138 has 8 divisors (see below), whose sum is σ = 105327120. Its totient is φ = 31598100.

The previous prime is 66707101. The next prime is 66707171. The reversal of 66707138 is 83170766.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 1755451 = 66707138 / (6 + 6 + 7 + 0 + 7 + 1 + 3 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877688 + ... + 877763.

It is an arithmetic number, because the mean of its divisors is an integer number (13165890).

Almost surely, 2^66707138 is an apocalyptic number.

66707138 is a deficient number, since it is larger than the sum of its proper divisors (38619982).

66707138 is a wasteful number, since it uses less digits than its factorization.

66707138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755472.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66707138 is about 8167.4437861549. The cubic root of 66707138 is about 405.5621680483.

The spelling of 66707138 in words is "sixty-six million, seven hundred seven thousand, one hundred thirty-eight".