640200606856 has 16 divisors (see below), whose sum is σ = 1207564021440. Its totient is φ = 318183534480.

The previous prime is 640200606841. The next prime is 640200606869. The reversal of 640200606856 is 658606002046.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239594700 + ... + 239597371.

It is an arithmetic number, because the mean of its divisors is an integer number (75472751340).

Almost surely, 2^640200606856 is an apocalyptic number.

It is an amenable number.

640200606856 is a deficient number, since it is larger than the sum of its proper divisors (567363414584).

640200606856 is a wasteful number, since it uses less digits than its factorization.

640200606856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479192244 (or 479192240 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 640200606856 in words is "six hundred forty billion, two hundred million, six hundred six thousand, eight hundred fifty-six".