868686868687 has 32 divisors (see below), whose sum is σ = 964513028160. Its totient is φ = 775763205120.

The previous prime is 868686868667. The next prime is 868686868697. The reversal of 868686868687 is 786868686868.

It is a cyclic number.

It is not a de Polignac number, because 868686868687 - 2²³ = 868678480079 is a prime.

It is a super-2 number, since 2×868686868687² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868686868627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298618989 + ... + 298621897.

It is an arithmetic number, because the mean of its divisors is an integer number (30141032130).

Almost surely, 2^868686868687 is an apocalyptic number.

868686868687 is a deficient number, since it is larger than the sum of its proper divisors (95826159473).

868686868687 is a wasteful number, since it uses less digits than its factorization.

868686868687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363.

The product of its digits is 14269022208, while the sum is 85.

The spelling of 868686868687 in words is "eight hundred sixty-eight billion, six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred eighty-seven".