686641174918 has 16 divisors (see below), whose sum is σ = 1044060526080. Its totient is φ = 338629843656.

The previous prime is 686641174841. The next prime is 686641174927. The reversal of 686641174918 is 819471146686.

It is a super-2 number, since 2×686641174918² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 2055180 + ... + 2365807.

It is an arithmetic number, because the mean of its divisors is an integer number (65253782880).

Almost surely, 2^686641174918 is an apocalyptic number.

686641174918 is a deficient number, since it is larger than the sum of its proper divisors (357419351162).

686641174918 is a wasteful number, since it uses less digits than its factorization.

686641174918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422051.

The product of its digits is 13934592, while the sum is 61.

The spelling of 686641174918 in words is "six hundred eighty-six billion, six hundred forty-one million, one hundred seventy-four thousand, nine hundred eighteen".