640131510305 has 16 divisors (see below), whose sum is σ = 888471690624. Its totient is φ = 433658797440.

The previous prime is 640131510283. The next prime is 640131510307. The reversal of 640131510305 is 503015131046.

It is not a de Polignac number, because 640131510305 - 2³⁴ = 622951641121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640131510307) 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, 110174636 + ... + 110180445.

It is an arithmetic number, because the mean of its divisors is an integer number (55529480664).

Almost surely, 2^640131510305 is an apocalyptic number.

It is an amenable number.

640131510305 is a deficient number, since it is larger than the sum of its proper divisors (248340180319).

640131510305 is a wasteful number, since it uses less digits than its factorization.

640131510305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220355176.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 640131510305 in words is "six hundred forty billion, one hundred thirty-one million, five hundred ten thousand, three hundred five".