66706985 has 8 divisors (see below), whose sum is σ = 81176256. Its totient is φ = 52613680.

The previous prime is 66706979. The next prime is 66706987. The reversal of 66706985 is 58960766.

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

It is not a de Polignac number, because 66706985 - 2¹⁸ = 66444841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66706987) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 93599 + ... + 94308.

It is an arithmetic number, because the mean of its divisors is an integer number (10147032).

Almost surely, 2^66706985 is an apocalyptic number.

It is an amenable number.

66706985 is a deficient number, since it is larger than the sum of its proper divisors (14469271).

66706985 is a wasteful number, since it uses less digits than its factorization.

66706985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187983.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 66706985 is about 8167.4344196939. The cubic root of 66706985 is about 405.5618579812.

The spelling of 66706985 in words is "sixty-six million, seven hundred six thousand, nine hundred eighty-five".