671838681318912 has 60 divisors (see below), whose sum is σ = 1938971923377060. Its totient is φ = 223946227104768.

The previous prime is 671838681318839. The next prime is 671838681318923. The reversal of 671838681318912 is 219813186838176.

671838681318912 is a `hidden beast` number, since 6 + 71 + 8 + 3 + 86 + 81 + 318 + 91 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72899157862 + ... + 72899167077.

It is an arithmetic number, because the mean of its divisors is an integer number (32316198722951).

Almost surely, 2^{671838681318912} is an apocalyptic number.

It is an amenable number.

671838681318912 is an abundant number, since it is smaller than the sum of its proper divisors (1267133242058148).

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

671838681318912 is a wasteful number, since it uses less digits than its factorization.

671838681318912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145798324963 (or 145798324944 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 72.

The spelling of 671838681318912 in words is "six hundred seventy-one trillion, eight hundred thirty-eight billion, six hundred eighty-one million, three hundred eighteen thousand, nine hundred twelve".