685191677 has 8 divisors (see below), whose sum is σ = 695329920. Its totient is φ = 675067120.

The previous prime is 685191649. The next prime is 685191691. The reversal of 685191677 is 776191586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685191677 - 2²⁰ = 684143101 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 (685191697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142403 + ... + 147135.

It is an arithmetic number, because the mean of its divisors is an integer number (86916240).

Almost surely, 2^685191677 is an apocalyptic number.

It is an amenable number.

685191677 is a deficient number, since it is larger than the sum of its proper divisors (10138243).

685191677 is a wasteful number, since it uses less digits than its factorization.

685191677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6843.

The product of its digits is 635040, while the sum is 50.

The square root of 685191677 is about 26176.1662013367. The cubic root of 685191677 is about 881.5981963441.

Subtracting 685191677 from its reverse (776191586), we obtain a palindrome (90999909).

The spelling of 685191677 in words is "six hundred eighty-five million, one hundred ninety-one thousand, six hundred seventy-seven".