871351728641646 has 16 divisors (see below), whose sum is σ = 1991661094038144. Its totient is φ = 248957636754744.

The previous prime is 871351728641627. The next prime is 871351728641743. The reversal of 871351728641646 is 646146827153178.

It is a super-2 number, since 2×871351728641646² (a number of 31 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 7 ways as a sum of consecutive naturals, for example, 10373234864740 + ... + 10373234864823.

It is an arithmetic number, because the mean of its divisors is an integer number (124478818377384).

Almost surely, 2^{871351728641646} is an apocalyptic number.

871351728641646 is an abundant number, since it is smaller than the sum of its proper divisors (1120309365396498).

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

871351728641646 is a wasteful number, since it uses less digits than its factorization.

871351728641646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20746469729575.

The product of its digits is 325140480, while the sum is 69.

The spelling of 871351728641646 in words is "eight hundred seventy-one trillion, three hundred fifty-one billion, seven hundred twenty-eight million, six hundred forty-one thousand, six hundred forty-six".