680855591 has 32 divisors (see below), whose sum is σ = 797247360. Its totient is φ = 576221184.

The previous prime is 680855579. The next prime is 680855639. The reversal of 680855591 is 195558086.

It is not a de Polignac number, because 680855591 - 2¹⁸ = 680593447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680855501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2020175 + ... + 2020511.

It is an arithmetic number, because the mean of its divisors is an integer number (24913980).

Almost surely, 2^680855591 is an apocalyptic number.

680855591 is a deficient number, since it is larger than the sum of its proper divisors (116391769).

680855591 is a wasteful number, since it uses less digits than its factorization.

680855591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 432000, while the sum is 47.

The square root of 680855591 is about 26093.2096722500. The cubic root of 680855591 is about 879.7345923958.

The spelling of 680855591 in words is "six hundred eighty million, eight hundred fifty-five thousand, five hundred ninety-one".