640845183124 has 12 divisors (see below), whose sum is σ = 1121484700084. Its totient is φ = 320420983104.

The previous prime is 640845183103. The next prime is 640845183137. The reversal of 640845183124 is 421381548046.

It can be written as a sum of positive squares in 2 ways, for example, as 237851290000 + 402993893124 = 487700^2 + 634818^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1233982 + ... + 1674634.

Almost surely, 2^640845183124 is an apocalyptic number.

It is an amenable number.

640845183124 is a deficient number, since it is larger than the sum of its proper divisors (480639516960).

640845183124 is a wasteful number, since it uses less digits than its factorization.

640845183124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804234 (or 804232 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 640845183124 in words is "six hundred forty billion, eight hundred forty-five million, one hundred eighty-three thousand, one hundred twenty-four".