66357317 has 8 divisors (see below), whose sum is σ = 73393656. Its totient is φ = 59596992.

The previous prime is 66357301. The next prime is 66357337. The reversal of 66357317 is 71375366.

It is a Cunningham number, because it is equal to 8146²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 276676 + 66080641 = 526^2 + 8129^2 .

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

It is not a de Polignac number, because 66357317 - 2⁴ = 66357301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66357337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68498 + ... + 69459.

It is an arithmetic number, because the mean of its divisors is an integer number (9174207).

Almost surely, 2^66357317 is an apocalyptic number.

It is an amenable number.

66357317 is a deficient number, since it is larger than the sum of its proper divisors (7036339).

66357317 is a wasteful number, since it uses less digits than its factorization.

66357317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138007.

The product of its digits is 79380, while the sum is 38.

The square root of 66357317 is about 8146.0000613798. Note that the first 4 decimals coincide. The cubic root of 66357317 is about 404.8519847267.

The spelling of 66357317 in words is "sixty-six million, three hundred fifty-seven thousand, three hundred seventeen".