671082685965647 has 16 divisors (see below), whose sum is σ = 729191701862400. Its totient is φ = 615252652391520.

The previous prime is 671082685965641. The next prime is 671082685965661. The reversal of 671082685965647 is 746569586280176.

It is a cyclic number.

It is not a de Polignac number, because 671082685965647 - 2¹⁶ = 671082685900111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671082685965641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320028854 + ... + 322118972.

It is an arithmetic number, because the mean of its divisors is an integer number (45574481366400).

Almost surely, 2^{671082685965647} is an apocalyptic number.

671082685965647 is a deficient number, since it is larger than the sum of its proper divisors (58109015896753).

671082685965647 is a wasteful number, since it uses less digits than its factorization.

671082685965647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635286.

The product of its (nonzero) digits is 7315660800, while the sum is 80.

The spelling of 671082685965647 in words is "six hundred seventy-one trillion, eighty-two billion, six hundred eighty-five million, nine hundred sixty-five thousand, six hundred forty-seven".