680716591 has 4 divisors (see below), whose sum is σ = 716543800. Its totient is φ = 644889384.

The previous prime is 680716573. The next prime is 680716627. The reversal of 680716591 is 195617086.

It is a happy number.

680716591 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.

It is a cyclic number.

It is not a de Polignac number, because 680716591 - 2⁹ = 680716079 is a prime.

It is a super-2 number, since 2×680716591² = 926750154525322562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680716501) 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, 17913576 + ... + 17913613.

It is an arithmetic number, because the mean of its divisors is an integer number (179135950).

Almost surely, 2^680716591 is an apocalyptic number.

680716591 is a deficient number, since it is larger than the sum of its proper divisors (35827209).

680716591 is a wasteful number, since it uses less digits than its factorization.

680716591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35827208.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 680716591 is about 26090.5460080850. The cubic root of 680716591 is about 879.6747209476.

The spelling of 680716591 in words is "six hundred eighty million, seven hundred sixteen thousand, five hundred ninety-one".