671214556881 has 32 divisors (see below), whose sum is σ = 1085219673600. Its totient is φ = 406636025040.

The previous prime is 671214556769. The next prime is 671214556891. The reversal of 671214556881 is 188655412176.

671214556881 is a `hidden beast` number, since 6 + 7 + 1 + 2 + 1 + 4 + 556 + 8 + 81 = 666.

It is not a de Polignac number, because 671214556881 - 2¹³ = 671214548689 is a prime.

It is a super-2 number, since 2×671214556881² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671214556891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309030 + ... + 1199136.

It is an arithmetic number, because the mean of its divisors is an integer number (33913114800).

Almost surely, 2^671214556881 is an apocalyptic number.

It is an amenable number.

671214556881 is a deficient number, since it is larger than the sum of its proper divisors (414005116719).

671214556881 is a wasteful number, since it uses less digits than its factorization.

671214556881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892666 (or 892660 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 54.

The spelling of 671214556881 in words is "six hundred seventy-one billion, two hundred fourteen million, five hundred fifty-six thousand, eight hundred eighty-one".