645286203617 has 16 divisors (see below), whose sum is σ = 721980604800. Its totient is φ = 571743744000.

The previous prime is 645286203599. The next prime is 645286203623. The reversal of 645286203617 is 716302682546.

It is a happy number.

It is not a de Polignac number, because 645286203617 - 2¹⁰ = 645286202593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645286203017) 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 15 ways as a sum of consecutive naturals, for example, 3576992 + ... + 3753057.

It is an arithmetic number, because the mean of its divisors is an integer number (45123787800).

Almost surely, 2^645286203617 is an apocalyptic number.

It is an amenable number.

645286203617 is a deficient number, since it is larger than the sum of its proper divisors (76694401183).

645286203617 is a wasteful number, since it uses less digits than its factorization.

645286203617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330264.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 645286203617 in words is "six hundred forty-five billion, two hundred eighty-six million, two hundred three thousand, six hundred seventeen".