640871735916725 has 12 divisors (see below), whose sum is σ = 794872027672320. Its totient is φ = 512574114452400.

The previous prime is 640871735916619. The next prime is 640871735916767. The reversal of 640871735916725 is 527619537178046.

640871735916725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640871735916725 - 2²⁸ = 640871467481269 is a prime.

It is a super-2 number, since 2×640871735916725² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3081750971 + ... + 3081958920.

It is an arithmetic number, because the mean of its divisors is an integer number (66239335639360).

It is a 1-persistent number, because it is pandigital, but 2⋅640871735916725 = 1281743471833450 is not.

Almost surely, 2^{640871735916725} is an apocalyptic number.

It is an amenable number.

640871735916725 is a deficient number, since it is larger than the sum of its proper divisors (154000291755595).

640871735916725 is a wasteful number, since it uses less digits than its factorization.

640871735916725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6163714060 (or 6163714055 counting only the distinct ones).

The product of its (nonzero) digits is 533433600, while the sum is 71.

The spelling of 640871735916725 in words is "six hundred forty trillion, eight hundred seventy-one billion, seven hundred thirty-five million, nine hundred sixteen thousand, seven hundred twenty-five".