640631004013 has 32 divisors (see below), whose sum is σ = 860684670720. Its totient is φ = 460505986560.

The previous prime is 640631003993. The next prime is 640631004031. The reversal of 640631004013 is 310400136046.

640631004013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640631004013 - 2¹³ = 640630995821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640631004043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1411731 + ... + 1809487.

It is an arithmetic number, because the mean of its divisors is an integer number (26896395960).

Almost surely, 2^640631004013 is an apocalyptic number.

It is an amenable number.

640631004013 is a deficient number, since it is larger than the sum of its proper divisors (220053666707).

640631004013 is a wasteful number, since it uses less digits than its factorization.

640631004013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399397.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 640631004013 in words is "six hundred forty billion, six hundred thirty-one million, four thousand, thirteen".