685555555 has 8 divisors (see below), whose sum is σ = 823478544. Its totient is φ = 547903200.

The previous prime is 685555523. The next prime is 685555567. The reversal of 685555555 is 555555586.

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

It is not a de Polignac number, because 685555555 - 2⁵ = 685555523 is a prime.

It is a Duffinian number.

685555555 is a modest number, since divided by 55555 gives 6855 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 685555499 and 685555508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62041 + ... + 72250.

It is an arithmetic number, because the mean of its divisors is an integer number (102934818).

Almost surely, 2^685555555 is an apocalyptic number.

685555555 is a deficient number, since it is larger than the sum of its proper divisors (137922989).

685555555 is a wasteful number, since it uses less digits than its factorization.

685555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135317.

The product of its digits is 3750000, while the sum is 49.

The square root of 685555555 is about 26183.1158382649. The cubic root of 685555555 is about 881.7542292854.

The spelling of 685555555 in words is "six hundred eighty-five million, five hundred fifty-five thousand, five hundred fifty-five".