871665355607886 has 96 divisors (see below), whose sum is σ = 2252263671889920. Its totient is φ = 238218010728192.

The previous prime is 871665355607873. The next prime is 871665355607887. The reversal of 871665355607886 is 688706553566178.

871665355607886 is a `hidden beast` number, since 8 + 7 + 1 + 6 + 6 + 53 + 556 + 0 + 7 + 8 + 8 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871665355607887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 785989171 + ... + 787097393.

It is an arithmetic number, because the mean of its divisors is an integer number (23461079915520).

Almost surely, 2^{871665355607886} is an apocalyptic number.

871665355607886 is an abundant number, since it is smaller than the sum of its proper divisors (1380598316282034).

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

871665355607886 is a wasteful number, since it uses less digits than its factorization.

871665355607886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379670 (or 1379667 counting only the distinct ones).

The product of its (nonzero) digits is 12192768000, while the sum is 81.

The spelling of 871665355607886 in words is "eight hundred seventy-one trillion, six hundred sixty-five billion, three hundred fifty-five million, six hundred seven thousand, eight hundred eighty-six".