640502016744 has 64 divisors (see below), whose sum is σ = 1624825036800. Its totient is φ = 210371587776.

The previous prime is 640502016743. The next prime is 640502016751. The reversal of 640502016744 is 447610205046.

It is not an unprimeable number, because it can be changed into a prime (640502016743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330777 + ... + 1179159.

It is an arithmetic number, because the mean of its divisors is an integer number (25387891200).

Almost surely, 2^640502016744 is an apocalyptic number.

It is an amenable number.

640502016744 is an abundant number, since it is smaller than the sum of its proper divisors (984323020056).

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

640502016744 is a wasteful number, since it uses less digits than its factorization.

640502016744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848854 (or 848850 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 640502016744 in words is "six hundred forty billion, five hundred two million, sixteen thousand, seven hundred forty-four".