640223585068 has 6 divisors (see below), whose sum is σ = 1120391273876. Its totient is φ = 320111792532.

The previous prime is 640223585039. The next prime is 640223585087. The reversal of 640223585068 is 860585322046.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80027948130 + ... + 80027948137.

Almost surely, 2^640223585068 is an apocalyptic number.

It is an amenable number.

640223585068 is a deficient number, since it is larger than the sum of its proper divisors (480167688808).

640223585068 is a wasteful number, since it uses less digits than its factorization.

640223585068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160055896271 (or 160055896269 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 640223585068 in words is "six hundred forty billion, two hundred twenty-three million, five hundred eighty-five thousand, sixty-eight".