680676671 has 4 divisors (see below), whose sum is σ = 680758344. Its totient is φ = 680595000.

The previous prime is 680676611. The next prime is 680676683. The reversal of 680676671 is 176676086.

680676671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176676086 = 2 ⋅88338043.

It is a cyclic number.

It is not a de Polignac number, because 680676671 - 2¹⁰ = 680675647 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 (680676611) 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, 26705 + ... + 45546.

It is an arithmetic number, because the mean of its divisors is an integer number (170189586).

Almost surely, 2^680676671 is an apocalyptic number.

680676671 is a deficient number, since it is larger than the sum of its proper divisors (81673).

680676671 is an equidigital number, since it uses as much as digits as its factorization.

680676671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81672.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 680676671 is about 26089.7809688008. The cubic root of 680676671 is about 879.6575247057.

The spelling of 680676671 in words is "six hundred eighty million, six hundred seventy-six thousand, six hundred seventy-one".