640325310256 has 10 divisors (see below), whose sum is σ = 1240630288652. Its totient is φ = 320162655120.

The previous prime is 640325310241. The next prime is 640325310269. The reversal of 640325310256 is 652013523046.

It is a super-3 number, since 3×640325310256³ (a number of 36 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 20010165930 + ... + 20010165961.

Almost surely, 2^640325310256 is an apocalyptic number.

It is an amenable number.

640325310256 is a deficient number, since it is larger than the sum of its proper divisors (600304978396).

640325310256 is a wasteful number, since it uses less digits than its factorization.

640325310256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40020331899 (or 40020331893 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 640325310256 in words is "six hundred forty billion, three hundred twenty-five million, three hundred ten thousand, two hundred fifty-six".