686578997819 has 8 divisors (see below), whose sum is σ = 806610291312. Its totient is φ = 576150207840.

The previous prime is 686578997809. The next prime is 686578997837. The reversal of 686578997819 is 918799875686.

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 686578997819 - 2²⁸ = 686310562363 is a prime.

It is a super-2 number, since 2×686578997819² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686578997809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2400625724 + ... + 2400626009.

It is an arithmetic number, because the mean of its divisors is an integer number (100826286414).

Almost surely, 2^686578997819 is an apocalyptic number.

686578997819 is a deficient number, since it is larger than the sum of its proper divisors (120031293493).

686578997819 is a wasteful number, since it uses less digits than its factorization.

686578997819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801251757.

The product of its digits is 3292047360, while the sum is 83.

The spelling of 686578997819 in words is "six hundred eighty-six billion, five hundred seventy-eight million, nine hundred ninety-seven thousand, eight hundred nineteen".