685659557 has 8 divisors (see below), whose sum is σ = 773785440. Its totient is φ = 601832560.

The previous prime is 685659511. The next prime is 685659599. The reversal of 685659557 is 755956586.

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 685659557 - 2²⁰ = 684610981 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 (685659257) 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, 1074383 + ... + 1075020.

It is an arithmetic number, because the mean of its divisors is an integer number (96723180).

Almost surely, 2^685659557 is an apocalyptic number.

It is an amenable number.

685659557 is a deficient number, since it is larger than the sum of its proper divisors (88125883).

685659557 is a wasteful number, since it uses less digits than its factorization.

685659557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149443.

The product of its digits is 11340000, while the sum is 56.

The square root of 685659557 is about 26185.1018138177. The cubic root of 685659557 is about 881.7988157845.

The spelling of 685659557 in words is "six hundred eighty-five million, six hundred fifty-nine thousand, five hundred fifty-seven".