6420185317 has 8 divisors (see below), whose sum is σ = 7901766656. Its totient is φ = 5079706992.

The previous prime is 6420185273. The next prime is 6420185357. The reversal of 6420185317 is 7135810246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420185317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420185357) 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, 35275653 + ... + 35275834.

It is an arithmetic number, because the mean of its divisors is an integer number (987720832).

Almost surely, 2^6420185317 is an apocalyptic number.

It is an amenable number.

6420185317 is a deficient number, since it is larger than the sum of its proper divisors (1481581339).

6420185317 is a wasteful number, since it uses less digits than its factorization.

6420185317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70551507.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 6420185317 is about 80126.0589134396. The cubic root of 6420185317 is about 1858.5854004063.

The spelling of 6420185317 in words is "six billion, four hundred twenty million, one hundred eighty-five thousand, three hundred seventeen".