685158881 has 8 divisors (see below), whose sum is σ = 748308864. Its totient is φ = 622152720.

The previous prime is 685158823. The next prime is 685158899. The reversal of 685158881 is 188851586.

685158881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 685158881 - 2²² = 680964577 is a prime.

It is a super-3 number, since 3×685158881³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685158811) 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, 25865 + ... + 45158.

It is an arithmetic number, because the mean of its divisors is an integer number (93538608).

Almost surely, 2^685158881 is an apocalyptic number.

It is an amenable number.

685158881 is a deficient number, since it is larger than the sum of its proper divisors (63149983).

685158881 is a wasteful number, since it uses less digits than its factorization.

685158881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71911.

The product of its digits is 614400, while the sum is 50.

The square root of 685158881 is about 26175.5397461065. The cubic root of 685158881 is about 881.5841305205.

The spelling of 685158881 in words is "six hundred eighty-five million, one hundred fifty-eight thousand, eight hundred eighty-one".