640515025460 has 12 divisors (see below), whose sum is σ = 1345081553508. Its totient is φ = 256206010176.

The previous prime is 640515025457. The next prime is 640515025523. The reversal of 640515025460 is 64520515046.

It can be written as a sum of positive squares in 2 ways, for example, as 458648599696 + 181866425764 = 677236^2 + 426458^2 .

It is a congruent number.

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, 16012875617 + ... + 16012875656.

It is an arithmetic number, because the mean of its divisors is an integer number (112090129459).

Almost surely, 2^640515025460 is an apocalyptic number.

It is an amenable number.

640515025460 is an abundant number, since it is smaller than the sum of its proper divisors (704566528048).

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

640515025460 is a wasteful number, since it uses less digits than its factorization.

640515025460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32025751282 (or 32025751280 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 640515025460 in words is "six hundred forty billion, five hundred fifteen million, twenty-five thousand, four hundred sixty".