686042718179 has 32 divisors (see below), whose sum is σ = 858828096000. Its totient is φ = 533505648384.

The previous prime is 686042718173. The next prime is 686042718211. The reversal of 686042718179 is 971817240686.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686042718179 is a prime.

It is a super-2 number, since 2×686042718179² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (686042718173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47341967 + ... + 47356455.

It is an arithmetic number, because the mean of its divisors is an integer number (26838378000).

Almost surely, 2^686042718179 is an apocalyptic number.

686042718179 is a deficient number, since it is larger than the sum of its proper divisors (172785377821).

686042718179 is a wasteful number, since it uses less digits than its factorization.

686042718179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23387.

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 686042718179 in words is "six hundred eighty-six billion, forty-two million, seven hundred eighteen thousand, one hundred seventy-nine".