671855883531840 has 2016 divisors, whose sum is σ = 2890670411566080. Its totient is φ = 145290304475136.

The previous prime is 671855883531829. The next prime is 671855883531887. The reversal of 671855883531840 is 48135388558176.

671855883531840 is a `hidden beast` number, since 6 + 7 + 1 + 8 + 5 + 5 + 8 + 8 + 3 + 531 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2016).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 331453320907 + ... + 331453322933.

Almost surely, 2^{671855883531840} is an apocalyptic number.

671855883531840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671855883531840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445335205783040).

671855883531840 is an abundant number, since it is smaller than the sum of its proper divisors (2218814528034240).

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

671855883531840 is a wasteful number, since it uses less digits than its factorization.

671855883531840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3250 counting only the distinct ones).

The product of its (nonzero) digits is 774144000, while the sum is 72.

The spelling of 671855883531840 in words is "six hundred seventy-one trillion, eight hundred fifty-five billion, eight hundred eighty-three million, five hundred thirty-one thousand, eight hundred forty".