686868163 has 4 divisors (see below), whose sum is σ = 687404808. Its totient is φ = 686331520.

The previous prime is 686868157. The next prime is 686868167. The reversal of 686868163 is 361868686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686868163 - 2⁵ = 686868131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686868163.

It is not an unprimeable number, because it can be changed into a prime (686868167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266398 + ... + 268963.

It is an arithmetic number, because the mean of its divisors is an integer number (171851202).

Almost surely, 2^686868163 is an apocalyptic number.

686868163 is a deficient number, since it is larger than the sum of its proper divisors (536645).

686868163 is a wasteful number, since it uses less digits than its factorization.

686868163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536644.

The product of its digits is 1990656, while the sum is 52.

The square root of 686868163 is about 26208.1697758542. The cubic root of 686868163 is about 882.3166246333.

The spelling of 686868163 in words is "six hundred eighty-six million, eight hundred sixty-eight thousand, one hundred sixty-three".