66317665 has 8 divisors (see below), whose sum is σ = 80116200. Its totient is φ = 52697472.

The previous prime is 66317651. The next prime is 66317687. The reversal of 66317665 is 56671366.

It can be written as a sum of positive squares in 4 ways, for example, as 9216 + 66308449 = 96^2 + 8143^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66317665 - 2⁵ = 66317633 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 43764 + ... + 45253.

It is an arithmetic number, because the mean of its divisors is an integer number (10014525).

Almost surely, 2^66317665 is an apocalyptic number.

It is an amenable number.

66317665 is a deficient number, since it is larger than the sum of its proper divisors (13798535).

66317665 is a wasteful number, since it uses less digits than its factorization.

66317665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89171.

The product of its digits is 136080, while the sum is 40.

The square root of 66317665 is about 8143.5658651478. The cubic root of 66317665 is about 404.7713285146.

The spelling of 66317665 in words is "sixty-six million, three hundred seventeen thousand, six hundred sixty-five".