671782638716 has 72 divisors (see below), whose sum is σ = 1365527288160. Its totient is φ = 283275159552.

The previous prime is 671782638691. The next prime is 671782638727. The reversal of 671782638716 is 617836287176.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126820580 + ... + 126825876.

It is an arithmetic number, because the mean of its divisors is an integer number (18965656780).

Almost surely, 2^671782638716 is an apocalyptic number.

It is an amenable number.

671782638716 is an abundant number, since it is smaller than the sum of its proper divisors (693744649444).

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

671782638716 is a wasteful number, since it uses less digits than its factorization.

671782638716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6451 (or 6382 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 62.

The spelling of 671782638716 in words is "six hundred seventy-one billion, seven hundred eighty-two million, six hundred thirty-eight thousand, seven hundred sixteen".