645839103871 has 12 divisors (see below), whose sum is σ = 699460240032. Its totient is φ = 596057157696.

The previous prime is 645839103859. The next prime is 645839103893. The reversal of 645839103871 is 178301938546.

It is not a de Polignac number, because 645839103871 - 2²⁹ = 645302232959 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 (645839103271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672570 + ... + 1320616.

It is an arithmetic number, because the mean of its divisors is an integer number (58288353336).

Almost surely, 2^645839103871 is an apocalyptic number.

645839103871 is a deficient number, since it is larger than the sum of its proper divisors (53621136161).

645839103871 is a wasteful number, since it uses less digits than its factorization.

645839103871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653970 (or 653957 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 645839103871 in words is "six hundred forty-five billion, eight hundred thirty-nine million, one hundred three thousand, eight hundred seventy-one".