685267855 has 4 divisors (see below), whose sum is σ = 822321432. Its totient is φ = 548214280.

The previous prime is 685267853. The next prime is 685267873. The reversal of 685267855 is 558762586.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 685267855 - 2¹ = 685267853 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 (685267853) 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, 68526781 + ... + 68526790.

It is an arithmetic number, because the mean of its divisors is an integer number (205580358).

Almost surely, 2^685267855 is an apocalyptic number.

685267855 is a deficient number, since it is larger than the sum of its proper divisors (137053577).

685267855 is a wasteful number, since it uses less digits than its factorization.

685267855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137053576.

The product of its digits is 4032000, while the sum is 52.

The square root of 685267855 is about 26177.6212632088. The cubic root of 685267855 is about 881.6308664717.

The spelling of 685267855 in words is "six hundred eighty-five million, two hundred sixty-seven thousand, eight hundred fifty-five".