685986666471 has 42 divisors (see below), whose sum is σ = 1032011867880. Its totient is φ = 455768873496.

The previous prime is 685986666461. The next prime is 685986666511. The reversal of 685986666471 is 174666689586.

It is not a de Polignac number, because 685986666471 - 2²² = 685982472167 is a prime.

It is a super-3 number, since 3×685986666471³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685986666471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685986666461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 423709300 + ... + 423710918.

It is an arithmetic number, because the mean of its divisors is an integer number (24571711140).

Almost surely, 2^685986666471 is an apocalyptic number.

685986666471 is a deficient number, since it is larger than the sum of its proper divisors (346025201409).

685986666471 is an frugal number, since it uses more digits than its factorization.

685986666471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615 (or 1981 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 72.

The spelling of 685986666471 in words is "six hundred eighty-five billion, nine hundred eighty-six million, six hundred sixty-six thousand, four hundred seventy-one".