640993213328 has 40 divisors (see below), whose sum is σ = 1407849475200. Its totient is φ = 280272334464.

The previous prime is 640993213321. The next prime is 640993213339. The reversal of 640993213328 is 823312399046.

It is not an unprimeable number, because it can be changed into a prime (640993213321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 81093368 + ... + 81101271.

It is an arithmetic number, because the mean of its divisors is an integer number (35196236880).

Almost surely, 2^640993213328 is an apocalyptic number.

It is an amenable number.

640993213328 is an abundant number, since it is smaller than the sum of its proper divisors (766856261872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640993213328 is a wasteful number, since it uses less digits than its factorization.

640993213328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162194679 (or 162194673 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 640993213328 in words is "six hundred forty billion, nine hundred ninety-three million, two hundred thirteen thousand, three hundred twenty-eight".