640451425524 has 24 divisors (see below), whose sum is σ = 1542592681728. Its totient is φ = 206597233920.

The previous prime is 640451425507. The next prime is 640451425529. The reversal of 640451425524 is 425524154046.

640451425524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640451425529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860821437 + ... + 860822180.

It is an arithmetic number, because the mean of its divisors is an integer number (64274695072).

Almost surely, 2^640451425524 is an apocalyptic number.

It is an amenable number.

640451425524 is an abundant number, since it is smaller than the sum of its proper divisors (902141256204).

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

640451425524 is a wasteful number, since it uses less digits than its factorization.

640451425524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721643655 (or 1721643653 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 42.

The spelling of 640451425524 in words is "six hundred forty billion, four hundred fifty-one million, four hundred twenty-five thousand, five hundred twenty-four".