671680717 has 4 divisors (see below), whose sum is σ = 671802496. Its totient is φ = 671558940.

The previous prime is 671680703. The next prime is 671680729. The reversal of 671680717 is 717086176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671680717 - 2⁷ = 671680589 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 (671680117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52203 + ... + 63784.

It is an arithmetic number, because the mean of its divisors is an integer number (167950624).

Almost surely, 2^671680717 is an apocalyptic number.

It is an amenable number.

671680717 is a deficient number, since it is larger than the sum of its proper divisors (121779).

671680717 is a wasteful number, since it uses less digits than its factorization.

671680717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121778.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 671680717 is about 25916.8037574080. The cubic root of 671680717 is about 875.7650851677.

The spelling of 671680717 in words is "six hundred seventy-one million, six hundred eighty thousand, seven hundred seventeen".