840535206871 has 16 divisors (see below), whose sum is σ = 891422400960. Its totient is φ = 789809011200.

The previous prime is 840535206851. The next prime is 840535206887. The reversal of 840535206871 is 178602535048.

It is a happy number.

It is not a de Polignac number, because 840535206871 - 2⁷ = 840535206743 is a prime.

It is a super-2 number, since 2×840535206871² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840535206851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84889021 + ... + 84898921.

It is an arithmetic number, because the mean of its divisors is an integer number (55713900060).

Almost surely, 2^840535206871 is an apocalyptic number.

840535206871 is a deficient number, since it is larger than the sum of its proper divisors (50887194089).

840535206871 is a wasteful number, since it uses less digits than its factorization.

840535206871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17514.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 840535206871 in words is "eight hundred forty billion, five hundred thirty-five million, two hundred six thousand, eight hundred seventy-one".